[lint] Fix indentation in .md files.

CODE_OF_CONDUCT.md

@@ -23,13 +23,13 @@ include:
 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
 * 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