Spell support for Documentation sections

[mtihlenfield]

It would be really nice to have spell support for keyword and module documentation. For example:

*** Settings ***
Documentation    could have spell checking here!

*** Keywords ***
Spell Check Keyword
    [Documentation]    could have spell checking here too!

For reference: https://neovim.io/doc/user/treesitter.html#treesitter-highlight-spell

[mtihlenfield]

Just realized that you can use variables in Documentation sections, which probably means this won't work.

[Hubro]

There's @spell and @nospell, the latter of which can be used to disable spell checking in interpolated variables. I think this is a good idea.

[Hubro]

It might be a bit tricky to actually match the Documentation setting. I'm using regex to match it case insensitively, so I don't think this would work: (setting_statement "Documentation" ...).

Changing the grammar to capture the setting name as a separate node, then matching it with the match? predicate would probably do the trick. It might even be possible without changing the grammar.