Update the tooltip text on the deployment limits message

What does this MR do and why?

Update the tooltip text on the deployment limits message to include documentation link: https://docs.gitlab.com/ee/user/project/pages/#limits

Followed these guidelines: https://docs.gitlab.com/ee/development/documentation/help#linking-to-help-in-ruby

Related: #463364 (closed)

Changelog: changed

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