Fix typos and grammar in templates

Bob Singhrequested to merge
gitlab-community/gitlab-org/gitlab-runner:docs/fix-typos into main

What does this MR do? Fixes minor typos and small grammar issues in documentation templates.

Why was this MR needed? Improves clarity and correctness of wording.

How to test Review changes in the diff Confirm wording reads correctly and consistently

Related issues N/A

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