Clean up plugin READMEs and a few plugins

- fasd
- history
- mercurial
- pylint
- repo
- yii2

plugins/docker-compose/README.md

@@ -4,7 +4,8 @@ This plugin provides completion for [docker-compose](https://docs.docker.com/com
 aliases for frequent docker-compose commands.
 
 To use it, add docker-compose to the plugins array of your zshrc file:
-```
+
+```zsh
 plugins=(... docker-compose)
 ```