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

docs/commands/README.md

@@ -2,7 +2,7 @@
 
 Pick any command from the checklist and write a comment acknowledging you started work.
 
-# Instructions for documenting a Nu command of your choosing
+## Instructions for documenting a Nu command of your choosing
 
 Name the file after the command, like so:
 
@@ -10,7 +10,7 @@ Name the file after the command, like so:
 
 Example: If you want to add documentation for the Nu command `enter`, create a file named `enter.md`, write documentation, save it at `/docs/commands/[your_command_picked].md` as  and create your pull request.
 
-# What kind of documentation should I write?
+## What kind of documentation should I write?
 
 Anything you want that you believe it *best* documents the command and the way you would like to see it. Here are some of our ideas of documentation we would *love* to see (feel free to add yours):
 
@@ -18,7 +18,7 @@ Anything you want that you believe it *best* documents the command and the way y
 * Description of the command.
 * Command usage.
 
-# Anything else?
+## Anything else?
 
 Of course! (These are drafts) so feel free to leave feedback and suggestions in the same file.