Clean up plugin READMEs and a few plugins

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

plugins/node/README.md

@@ -1,16 +1,19 @@
 # node plugin
 
+This plugin adds `node-docs` function that opens specific section in [Node.js](https://nodejs.org)
+documentation (depending on the installed version).
+
 To use it, add `node` to the plugins array of your zshrc file:
+
 ```zsh
 plugins=(... node)
 ```
 
-This plugin adds `node-docs` function that open specific section in [Node.js](https://nodejs.org) documentation (depending on the installed version).
-For example:
+## Usage
 
 ```zsh
 # Opens https://nodejs.org/docs/latest-v10.x/api/fs.html
 $ node-docs fs
 # Opens https://nodejs.org/docs/latest-v10.x/api/path.html
-$ node-docs path 
+$ node-docs path
 ```