Add issue link to comment in controller yaml

[ghost]

Changes

In commit 49a7fa2 we added
a workaround for an issue that can cause the tekton controller
to be delayed launching taskruns for the first time.

This commit updates the comment on the workaround to include
an issue link with more information about the reason for the
workaround.

/kind documentation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs included if any changes are user facing
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been filled in or deleted (only if no user facing changes)

Release Notes

NONE

[pritidesai]

thanks @sbwsg
/approve
/lgtm

[tekton-robot]

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