 JENKINS-59513 - Fixed defunct hyperlink in PULL_REQUEST_TEMPLATE.md (#4222)
 JENKINS-59513 - Fixed defunct hyperlink in PULL_REQUEST_TEMPLATE.md (#4222)

* Update PULL_REQUEST_TEMPLATE.md

Removed a defunct hyperlink and placed an intuitive directive in its place.

* Updated PULL_REQUEST_TEMPLATE.md to include comment

* Updated PULL_REQUEST_TEMPLATE.md to include lts backporting

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