Clean up plugin READMEs and a few plugins

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

plugins/compleat/README.md

@@ -3,6 +3,7 @@
 This plugin looks for [compleat](https://github.com/mbrubeck/compleat) and loads its completion.
 
 To use it, add compleat to the plugins array in your zshrc file:
-```
+
+```zsh
 plugins=(... compleat)
 ```