Improve the use of upgrade and update words docs
requested to merge gitlab-community/gitlab:daelmo-correct-upgrade-word-upgrading-handbook-docs into master
What does this MR do and why?
Improve the use of the upgrade word upgrading from source docs, https://docs.gitlab.com/ee/development/documentation/styleguide/word_list.html#update.
Related issues
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I have evaluated the MR acceptance checklist for this MR.