doc: improve the process for landing a PR
Even though incident could still happen like https://github.com/nodejs/node/pull/54554 (which was partially my fault and I learned the lesson), I wanted to share my thoughts and hope to reduce the potential breakage in the future. As I noticed the other PR in net landed and I should've taken a closer look, or even just re-trigger the CI when in doubt, both approaches would help me to catch the test failure earlier.
Wording is not my expertise, happy for any suggestions