First pass at updating all documentation formatting and cleaning up output of examples (#2031)

docs/commands/start.md

@@ -4,11 +4,11 @@ Opens each file/directory/URL using the default application.
 
 Syntax: `start ...args{flags}`
 
-### Parameters
+## Parameters
 
 * `args`: a list of space-separated files to open
 
-### Flags
+## Flags
 
     -a --application <string>
       Specifies the application used for opening the files/directories/urls
@@ -16,11 +16,13 @@ Syntax: `start ...args{flags}`
 ## Example
 
 Open `index.html` in the system's default browser (cross platform):
+
 ```shell
 > start index.html
 ```
 
 Open `index.html` in Firefox (specific path for OSX):
+
 ```shell
 start index.html -a /Applications/Firefox.app
 ```