Update capitalization.rst

Author: manojtummala

docs/DocumentationStyleGuide/language-grammar/capitalization.rst

@@ -22,7 +22,7 @@ The guidelines in this case are:
    like blog posts, research paper titles to use initial uppercase
    letters for all significant words in the text.
 -  More detailed explanation on sentence case:
-      In sentence case, lowercase most words in a title or heading. Capitalize only the following words:
+      - In sentence case, lowercase most words in a title or heading. Capitalize only the following words:
          - The first word of the title or heading
          - The first word of a subtitle
          - The first word after a colon, em dash, or end punctuation in a heading