Fix 'top left' and 'top right' in docs

What does this MR do and why?

This MR replaces all instances of top left and top right in the gitlab repo with upper left and upper right and hyphenates the forms when used as adjectives.

Related guidance

https://docs.gitlab.com/ee/development/documentation/styleguide/word_list.html#upper-left-upper-right

Related issue

!109684 (merged)

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MR acceptance checklist

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Edited by Ashraf Khamis

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