diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index e968c8f..7d7fc56 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -160,7 +160,7 @@
    In both cases, *\*buffer_length* is set to the length of the encoded data
    without the trailing NUL byte.
 
-``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer]
+``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer, int \*buffer_length]
    Same as ``es#`` except that string objects are passed through without recoding
    them. Instead, the implementation assumes that the string object uses the
    encoding passed in as parameter.
diff --git a/Doc/c-api/buffer.rst b/Doc/c-api/buffer.rst
index 6ad4f7b..97adb07 100644
--- a/Doc/c-api/buffer.rst
+++ b/Doc/c-api/buffer.rst
@@ -144,7 +144,7 @@
       kind of buffer the caller is prepared to deal with and therefore what
       kind of buffer the exporter is allowed to return.  The buffer interface
       allows for complicated memory sharing possibilities, but some caller may
-      not be able to handle all the complexibity but may want to see if the
+      not be able to handle all the complexity but may want to see if the
       exporter will let them take a simpler view to its memory.
 
       Some exporters may not be able to share memory in every possible way and
diff --git a/Doc/c-api/float.rst b/Doc/c-api/float.rst
index 77a8b83..e2e4b73 100644
--- a/Doc/c-api/float.rst
+++ b/Doc/c-api/float.rst
@@ -64,16 +64,16 @@
    around the header file :file:`float.h`.
 
 
-.. cfunction:: double PyFloat_GetMax(void)
+.. cfunction:: double PyFloat_GetMax()
 
    Return the maximum representable finite float *DBL_MAX* as C :ctype:`double`.
 
 
-.. cfunction:: double PyFloat_GetMin(void)
+.. cfunction:: double PyFloat_GetMin()
 
    Return the minimum normalized positive float *DBL_MIN* as C :ctype:`double`.
 
-.. cfunction:: int PyFloat_ClearFreeList(void)
+.. cfunction:: int PyFloat_ClearFreeList()
 
    Clear the float free list. Return the number of items that could not
    be freed.
diff --git a/Doc/c-api/import.rst b/Doc/c-api/import.rst
index ac4cde5..2e3f71f 100644
--- a/Doc/c-api/import.rst
+++ b/Doc/c-api/import.rst
@@ -137,7 +137,7 @@
    *path*, possibly by fetching it from the :data:`sys.path_importer_cache`
    dict.  If it wasn't yet cached, traverse :data:`sys.path_hooks` until a hook
    is found that can handle the path item.  Return ``None`` if no hook could;
-   this tells our caller it should fall back to the builtin import mechanism.
+   this tells our caller it should fall back to the built-in import mechanism.
    Cache the result in :data:`sys.path_importer_cache`.  Return a new reference
    to the importer object.
 
diff --git a/Doc/c-api/method.rst b/Doc/c-api/method.rst
index 9ee49ba..d8b2ed8 100644
--- a/Doc/c-api/method.rst
+++ b/Doc/c-api/method.rst
@@ -94,7 +94,7 @@
    Macro version of :cfunc:`PyMethod_Self` which avoids error checking.
 
 
-.. cfunction:: int PyMethod_ClearFreeList(void)
+.. cfunction:: int PyMethod_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
diff --git a/Doc/c-api/structures.rst b/Doc/c-api/structures.rst
index 7048968..87bd362 100644
--- a/Doc/c-api/structures.rst
+++ b/Doc/c-api/structures.rst
@@ -146,12 +146,10 @@
 
    This is the typical calling convention, where the methods have the type
    :ctype:`PyCFunction`. The function expects two :ctype:`PyObject\*` values.
-   The first one is the *self* object for methods; for module functions, it
-   has the value given to :cfunc:`Py_InitModule4` (or *NULL* if
-   :cfunc:`Py_InitModule` was used).  The second parameter (often called
-   *args*) is a tuple object representing all arguments. This parameter is
-   typically processed using :cfunc:`PyArg_ParseTuple` or
-   :cfunc:`PyArg_UnpackTuple`.
+   The first one is the *self* object for methods; for module functions, it is
+   the module object.  The second parameter (often called *args*) is a tuple
+   object representing all arguments. This parameter is typically processed
+   using :cfunc:`PyArg_ParseTuple` or :cfunc:`PyArg_UnpackTuple`.
 
 
 .. data:: METH_KEYWORDS
@@ -167,9 +165,9 @@
 
    Methods without parameters don't need to check whether arguments are given if
    they are listed with the :const:`METH_NOARGS` flag.  They need to be of type
-   :ctype:`PyCFunction`.  When used with object methods, the first parameter is
-   typically named ``self`` and will hold a reference to the object instance.
-   In all cases the second parameter will be *NULL*.
+   :ctype:`PyCFunction`.  The first parameter is typically named *self* and will
+   hold a reference to the module or object instance.  In all cases the second
+   parameter will be *NULL*.
 
 
 .. data:: METH_O
diff --git a/Doc/c-api/sys.rst b/Doc/c-api/sys.rst
index 15f1af4..adadfe5 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -73,7 +73,7 @@
    case *name* is deleted from the sys module. Returns ``0`` on success, ``-1``
    on error.
 
-.. cfunction:: void PySys_ResetWarnOptions(void)
+.. cfunction:: void PySys_ResetWarnOptions()
 
    Reset :data:`sys.warnoptions` to an empty list.
 
diff --git a/Doc/c-api/tuple.rst b/Doc/c-api/tuple.rst
index a66f043..c1f8e12 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -107,6 +107,6 @@
    raises :exc:`MemoryError` or :exc:`SystemError`.
 
 
-.. cfunction:: int PyTuple_ClearFreeList(void)
+.. cfunction:: int PyTuple_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
diff --git a/Doc/c-api/type.rst b/Doc/c-api/type.rst
index 07f82c9..d0edd55 100644
--- a/Doc/c-api/type.rst
+++ b/Doc/c-api/type.rst
@@ -33,7 +33,7 @@
    standard type object.  Return false in all other cases.
 
 
-.. cfunction:: unsigned int PyType_ClearCache(void)
+.. cfunction:: unsigned int PyType_ClearCache()
 
    Clear the internal lookup cache. Return the current version tag.
 
diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index e348ee7..dc48158 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -84,10 +84,11 @@
    :ctype:`PyUnicodeObject` (not checked).
 
 
-.. cfunction:: int PyUnicode_ClearFreeList(void)
+.. cfunction:: int PyUnicode_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
+
 Unicode provides many different character properties. The most often needed ones
 are available through these macros which are mapped to C functions depending on
 the Python configuration.
@@ -372,12 +373,12 @@
 Built-in Codecs
 ^^^^^^^^^^^^^^^
 
-Python provides a set of builtin codecs which are written in C for speed. All of
+Python provides a set of built-in codecs which are written in C for speed. All of
 these codecs are directly usable via the following functions.
 
 Many of the following APIs take two arguments encoding and errors. These
 parameters encoding and errors have the same semantics as the ones of the
-builtin unicode() Unicode object constructor.
+built-in :func:`unicode` Unicode object constructor.
 
 Setting encoding to *NULL* causes the default encoding to be used
 which is ASCII.  The file system calls should use
@@ -389,7 +390,7 @@
 
 Error handling is set by errors which may also be set to *NULL* meaning to use
 the default handling defined for the codec.  Default error handling for all
-builtin codecs is "strict" (:exc:`ValueError` is raised).
+built-in codecs is "strict" (:exc:`ValueError` is raised).
 
 The codecs all use a similar interface.  Only deviation from the following
 generic ones are documented for simplicity.
@@ -403,7 +404,7 @@
 
    Create a Unicode object by decoding *size* bytes of the encoded string *s*.
    *encoding* and *errors* have the same meaning as the parameters of the same name
-   in the :func:`unicode` builtin function.  The codec to be used is looked up
+   in the :func:`unicode` built-in function.  The codec to be used is looked up
    using the Python codec registry.  Return *NULL* if an exception was raised by
    the codec.