Merge pull request #2187 from openedx/feanil/quick_update

docs: Update ExampleRSTFile.rst

Author: feanil

en_us/edx_style_guide/source/ExampleRSTFile.rst

@@ -22,26 +22,20 @@ Heading Levels
 
 ::
 
- #############
  Heading 1
- #############
+ #########
 
- *************
  Heading 2
- *************
+ *********
 
- ===========
  Heading 3
- ===========
+ =========
 
  Heading 4
- ************
+ ---------
 
  Heading 5
- ===========
-
- Heading 6
- ~~~~~~~~~~~
+ ~~~~~~~~~
 
 ************************************************
 Paragraph Text and Commented Text