doc,meta: allow Travis results for doc/comment changes

Permit the use of Travis CI results for pull requests that only change
documentation or comments. This also removes
node-test-pull-request-lite-pipeline from the documentation. Efforts to
move all CI jobs to pipelines have stalled and it's not clear that our
current Jenkins admins are enthusiastic about pipelines.

PR-URL: https://github.com/nodejs/node/pull/30330


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>