Run vale on Doc-Strings in Julia (again)

[kellertuer]

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• Completed

Describe the feature

The homepage still states

julia | .jl | # (text.comment.line.ext), "..." (text.comment.line.ext) #= (text.comment.block.ext), """(text.comment.block.ext)

Where especially strings and block strings are mentioned. I implemented that before the move to tree sitter, because the block strings (there """) are used for documentation, and that should for sure be valed. Can we have that back? That would be great. If necessary maybe also in a new text.documentation or so type?