Merge pull request #366 from tschm/patch-3

Update .markdown.rb

Author: camdecoster

.markdown.rb

@@ -1,3 +1,8 @@
+# MD026: Trailing punctuation in header - Disallows headers ending with specified punctuation characters
 rule 'MD026', :punctuation => '.,;:!'
+
+# MD013: Line length - Enforces a maximum line length, but ignores code blocks
 rule 'MD013', :ignore_code_blocks => true
+
+# MD033: Inline HTML - This rule is excluded, allowing inline HTML in Markdown files
 exclude_rule 'MD033'