bpo-38738: Fix formatting of True and False. (GH-17083)

* "Return true/false" is replaced with "Return ``True``/``False``"
  if the function actually returns a bool.
* Fixed formatting of some True and False literals (now in monospace).
* Replaced "True/False" with "true/false" if it can be not only bool.
* Replaced some 1/0 with True/False if it corresponds the code.
* "Returns <bool>" is replaced with "Return <bool>".
diff --git a/Doc/library/logging.handlers.rst b/Doc/library/logging.handlers.rst
index eccd0ae..059ab3d 100644
--- a/Doc/library/logging.handlers.rst
+++ b/Doc/library/logging.handlers.rst
@@ -867,8 +867,8 @@
 
    .. method:: emit(record)
 
-      Appends the record to the buffer. If :meth:`shouldFlush` returns true,
-      calls :meth:`flush` to process the buffer.
+      Append the record to the buffer. If :meth:`shouldFlush` returns true,
+      call :meth:`flush` to process the buffer.
 
 
    .. method:: flush()
@@ -879,7 +879,7 @@
 
    .. method:: shouldFlush(record)
 
-      Returns true if the buffer is up to capacity. This method can be
+      Return ``True`` if the buffer is up to capacity. This method can be
       overridden to implement custom flushing strategies.