More typo, grammar, and style fixes

docs/intro/documentation.rst

@@ -35,14 +35,14 @@ pydoc
 :program:`pydoc` is a utility that is installed when you install Python.
 It allows you to quickly retrieve and search for documentation from your
 shell. For example, if you needed a quick refresher on the
-:mod:`time` module, pulling up documentation would be as simple as
+:mod:`time` module, pulling up documentation would be as simple as:
 
     .. code-block:: console
 
        $ pydoc time
 
 The above command is essentially equivalent to opening the Python REPL
-and running
+and running:
 
     .. code-block:: pycon