epy_docgen.sh: change directory name for generated doc to BPY_API_237

for upcoming release.
Font.py:  fix a couple of warnings about mismatched header underlines.

source/blender/python/api2_2x/doc/Font.py

@@ -4,7 +4,7 @@
 The Blender.Text3d.Font subsubmodule.
 
 Text3d.Font Objects
-==============
+===================
 
 This module provides access to B{Font} objects in Blender.
 
@@ -45,7 +45,7 @@ def Get (name = None):
 class Font:
   """
   The Text3d.Font object
-  =================
+  ======================
     This object gives access  Blender's B{Font} objects
   @cvar name: The Text3d name.
   @cvar filename: The filename of the file loaded into this Text.

source/blender/python/api2_2x/doc/epy_docgen.sh

@@ -4,6 +4,6 @@
 # run from the doc directory containing the .py files
 # usage:  sh epy_docgen.sh
 
-epydoc -o BPY_API_236 --url "http://www.blender.org" -t API_intro.py \
+epydoc -o BPY_API_237 --url "http://www.blender.org" -t API_intro.py \
  -n "Blender" --no-private --no-frames \
 $( ls [A-Z]*.py )