Update mutation type file name in docs
What does this MR do and why?
Tiny MR - in going through the GraphQl mutations style guide, I noticed the file name was incorrectly pluralized for:
https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/graphql/types/mutation_type.rb
app/graphql/types/mutation_type.rb
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Missy Davies