Separate pod template doc

[eddycharly]

Changes

Currently the same pod template documentation is duplicated in docs/taskruns.md and docs/pipelineruns.md, this makes it difficult to maintain.

This pull request creates a dedicated documentation page for pod templates and replaces the duplicated content by links to the dedicate documentation.

This should make it easier to maintain documentation and consistency.

[tekton-robot]

Hi @eddycharly. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[eddycharly]

/assign @dibyom

[dibyom]

/ok-to-test

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[dibyom]

/lgtm