diff --git a/Doc/library/binascii.rst b/Doc/library/binascii.rst
index 3f7df74..e3f134b 100644
--- a/Doc/library/binascii.rst
+++ b/Doc/library/binascii.rst
@@ -59,7 +59,7 @@
    should be at most 57 to adhere to the base64 standard.
 
 
-.. function:: a2b_qp(string, header=False)
+.. function:: a2b_qp(data, header=False)
 
    Convert a block of quoted-printable data back to binary and return the binary
    data. More than one line may be passed at a time. If the optional argument
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index d677b39..7aacd01 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -863,9 +863,9 @@
       :data:`os.SEEK_HOLE` or :data:`os.SEEK_DATA`.
 
 
-.. function:: open(file, flags, mode=0o777, *, dir_fd=None)
+.. function:: open(path, flags, mode=0o777, *, dir_fd=None)
 
-   Open the file *file* and set various flags according to *flags* and possibly
+   Open the file *path* and set various flags according to *flags* and possibly
    its mode according to *mode*.  When computing *mode*, the current umask value
    is first masked out.  Return the file descriptor for the newly opened file.
    The new file descriptor is :ref:`non-inheritable <fd_inheritance>`.
@@ -1071,10 +1071,10 @@
       :meth:`~file.read` or :meth:`~file.readline` methods.
 
 
-.. function:: sendfile(out, in, offset, nbytes)
-              sendfile(out, in, offset, nbytes, headers=None, trailers=None, flags=0)
+.. function:: sendfile(out, in, offset, count)
+              sendfile(out, in, offset, count, headers=None, trailers=None, flags=0)
 
-   Copy *nbytes* bytes from file descriptor *in* to file descriptor *out*
+   Copy *count* bytes from file descriptor *in* to file descriptor *out*
    starting at *offset*.
    Return the number of bytes sent. When EOF is reached return 0.
 
@@ -1088,7 +1088,7 @@
    *trailers* are arbitrary sequences of buffers that are written before and
    after the data from *in* is written. It returns the same as the first case.
 
-   On Mac OS X and FreeBSD, a value of 0 for *nbytes* specifies to send until
+   On Mac OS X and FreeBSD, a value of 0 for *count* specifies to send until
    the end of *in* is reached.
 
    All platforms support sockets as *out* file descriptor, and some platforms
@@ -1683,10 +1683,10 @@
       The *dir_fd* argument.
 
 
-.. function:: mknod(filename, mode=0o600, device=0, *, dir_fd=None)
+.. function:: mknod(path, mode=0o600, device=0, *, dir_fd=None)
 
    Create a filesystem node (file, device special file or named pipe) named
-   *filename*. *mode* specifies both the permissions to use and the type of node
+   *path*. *mode* specifies both the permissions to use and the type of node
    to be created, being combined (bitwise OR) with one of ``stat.S_IFREG``,
    ``stat.S_IFCHR``, ``stat.S_IFBLK``, and ``stat.S_IFIFO`` (those constants are
    available in :mod:`stat`).  For ``stat.S_IFCHR`` and ``stat.S_IFBLK``,
@@ -2210,9 +2210,9 @@
    .. versionadded:: 3.3
 
 
-.. function:: symlink(source, link_name, target_is_directory=False, *, dir_fd=None)
+.. function:: symlink(src, dst, target_is_directory=False, *, dir_fd=None)
 
-   Create a symbolic link pointing to *source* named *link_name*.
+   Create a symbolic link pointing to *src* named *dst*.
 
    On Windows, a symlink represents either a file or a directory, and does not
    morph to the target dynamically.  If the target is present, the type of the
@@ -2282,20 +2282,20 @@
       The *dir_fd* parameter.
 
 
-.. function:: utime(path, times=None, *, ns=None, dir_fd=None, follow_symlinks=True)
+.. function:: utime(path, times=None, *[, ns], dir_fd=None, follow_symlinks=True)
 
    Set the access and modified times of the file specified by *path*.
 
    :func:`utime` takes two optional parameters, *times* and *ns*.
    These specify the times set on *path* and are used as follows:
 
-   - If *ns* is not ``None``,
+   - If *ns* is specified,
      it must be a 2-tuple of the form ``(atime_ns, mtime_ns)``
      where each member is an int expressing nanoseconds.
    - If *times* is not ``None``,
      it must be a 2-tuple of the form ``(atime, mtime)``
      where each member is an int or float expressing seconds.
-   - If *times* and *ns* are both ``None``,
+   - If *times* is ``None`` and *ns* is unspecified,
      this is equivalent to specifying ``ns=(atime_ns, mtime_ns)``
      where both times are the current time.
 
@@ -2846,9 +2846,10 @@
    Availability: Unix.
 
 
-.. function:: popen(command, mode='r', buffering=-1)
+.. function:: popen(cmd, mode='r', buffering=-1)
 
-   Open a pipe to or from *command*.  The return value is an open file object
+   Open a pipe to or from command *cmd*.
+   The return value is an open file object
    connected to the pipe, which can be read or written depending on whether *mode*
    is ``'r'`` (default) or ``'w'``. The *buffering* argument has the same meaning as
    the corresponding argument to the built-in :func:`open` function. The
diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index b178fe1..aea0e79 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -58,7 +58,7 @@
    Raises the :exc:`error` exception if any error occurs.
 
 
-.. function:: compressobj(level=-1, method=DEFLATED, wbits=15, memlevel=8, strategy=Z_DEFAULT_STRATEGY[, zdict])
+.. function:: compressobj(level=-1, method=DEFLATED, wbits=15, memLevel=8, strategy=Z_DEFAULT_STRATEGY[, zdict])
 
    Returns a compression object, to be used for compressing data streams that won't
    fit into memory at once.
@@ -75,9 +75,9 @@
    should be an integer from ``8`` to ``15``. Higher values give better
    compression, but use more memory.
 
-   *memlevel* controls the amount of memory used for internal compression state.
-   Valid values range from ``1`` to ``9``. Higher values using more memory,
-   but are faster and produce smaller output.
+   The *memLevel* argument controls the amount of memory used for the
+   internal compression state. Valid values range from ``1`` to ``9``.
+   Higher values use more memory, but are faster and produce smaller output.
 
    *strategy* is used to tune the compression algorithm. Possible values are
    ``Z_DEFAULT_STRATEGY``, ``Z_FILTERED``, and ``Z_HUFFMAN_ONLY``.