Document --pretty

[kbd]

For many tools I desire behavior like less's --quit-if-one-screen. So, if output fills more than one screen, page it and don't spam my terminal with gobs of output.

However, piping to less often turns off many tools' automatic colorized output. Accordingly, many tools support flags to force colorized output. So, I have a small autopager script that I configure for a bunch of tools as follows:

alias http='autopager http --pretty=all'
alias https='autopager https --pretty=all'
alias jq='autopager jq -C'
alias curl='autopager curl "" -L'
alias curlie='autopager curlie --pretty -L'
alias xh='autopager xh --pretty=all'
alias yq='autopager yq -C'

I had to read curlie's source to (happily) discover that curlie supports the same pattern. This PR documents the flag.