docs: clarify usage of tweaks and indentation in core.esupports.indent

[suwuako]

First time contrib here - first time using org mode for takign notes and struggled for ~2 hours trying to figure out indentation. Felt it was necessary to send in a PR so others would have a easier path :) lmk if anything isn't up to par and I'll be more than happy to fix it 😄

[wjyoung65]

@suwuako thank you for the comment in your change about InspectTree! Been racking my brain all day trying to figure out why @end is getting indented, but @code is not. Still don't know why, but InspectTree helped me figure out it was a ranged_verbatim_tag_end and not ranged_tag_end. So now at least I can set the indent to -1 or 0 and make it behave the way I want.

[suwuako]

glad i could help :)

[benlubas]

lgtm! Thanks