simple markup fixes (#594)

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## Pull Request Details

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Pull Request resolved: #594

Test Plan: **Add your test plan here**

Reviewed By: tianqibt

Differential Revision: D17932461

Pulled By: joesus

fbshipit-source-id: 82cf916254b06170103bbceaddc655c5c69d4393

CODE_OF_CONDUCT.md

@@ -14,22 +14,22 @@ appearance, race, religion, or sexual identity and orientation.
 Examples of behavior that contributes to creating a positive environment
 include:
 
-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
+* Using welcoming and inclusive language.
+* Being respectful of differing viewpoints and experiences.
+* Gracefully accepting constructive criticism.
+* Focusing on what is best for the community.
+* Showing empathy towards other community members.
 
 Examples of unacceptable behavior by participants include:
 
 * The use of sexualized language or imagery and unwelcome sexual attention or
-  advances
+  advances.
 * Trolling, insulting/derogatory comments, and personal or political attacks
-* Public or private harassment
+* Public or private harassment.
 * Publishing others' private information, such as a physical or electronic
-  address, without explicit permission
+  address, without explicit permission.
 * Other conduct which could reasonably be considered inappropriate in a
-  professional setting
+  professional setting.
 
 ## Our Responsibilities