Add note that runner tags must match exactly (case-sensitive)

The page mentions runner tags but doesn't warn users that tags are case-sensitive, which causes common matching failures.

Location https://docs.gitlab.com/ee/ci/runners/

Current Text "GitLab checks for available runners that match: Runner tags"

Suggested Fix Add a warning: "⚠️ IMPORTANT: Runner tags are case-sensitive. A job looking for tag docker will NOT match a runner with tag Docker or DOCKER. Use exact matches only."

Why This Helps Prevents a common frustration where jobs wait indefinitely for runners that will never match.

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