Update docs 6

1. Added example of squish!
2. Added example of remove
3. Added example of remove!
4. Added test case for removal of multiple occurrences of pattern.
It's not a line break it's whitespace. Looks like you have an extra added space or 2 :smile_cat: 

I add this to my .vimrc to highlight whitespace in bright red. Hope that helps!

```
" Hightlight whitespace and tabs
highlight ExtraWhitespace ctermbg=red guibg=red
match ExtraWhitespace /\s\+$/
autocmd BufWinEnter * match ExtraWhitespace /\s\+$/
autocmd InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/
autocmd InsertLeave * match ExtraWhitespace /\s\+$/
```