doc: fix func/meth references to Sphinx

doc/extdev/parserapi.rst

@@ -12,7 +12,7 @@ __ http://docutils.sourceforge.net/docs/dev/hacking.html#parsing-the-document
 
 In Sphinx, the parser modules works as same as docutils.  The parsers are
 registered to Sphinx by extensions using Application APIs;
-:meth:`Sphinx.add_source_suffix()` and :meth:`Sphinx.add_source_parsers()`.
+:meth:`.Sphinx.add_source_suffix()` and :meth:`.Sphinx.add_source_parsers()`.
 
 The *source suffix* is a mapping from file suffix to file type.  For example,
 ``.rst`` file is mapped to ``'restructuredtext'`` type.  Sphinx uses the

doc/usage/configuration.rst

@@ -142,7 +142,7 @@ General configuration
    .. versionadded:: 1.3
 
    .. deprecated:: 1.8
-      Now Sphinx provides an API :meth:`Sphinx.add_source_parser` to register
+      Now Sphinx provides an API :meth:`.Sphinx.add_source_parser` to register
       a source parser.  Please use it instead.
 
 .. confval:: master_doc

doc/usage/restructuredtext/roles.rst

@@ -62,7 +62,7 @@ Cross-referencing anything
      by :rst:role:`doc`, :rst:role:`ref` or :rst:role:`option`.
 
      Custom objects added to the standard domain by extensions (see
-     :meth:`Sphinx.add_object_type`) are also searched.
+     :meth:`.Sphinx.add_object_type`) are also searched.
 
    * Then, it looks for objects (targets) in all loaded domains.  It is up to
      the domains how specific a match must be.  For example, in the Python

sphinx/application.py

@@ -642,7 +642,7 @@ class Sphinx(object):
         a title.
 
         Other keyword arguments are used for node visitor functions. See the
-        :meth:`Sphinx.add_node` for details.
+        :meth:`.Sphinx.add_node` for details.
 
         .. versionadded:: 1.4
         """