Document PR commits preference in CONTRIBUTING.md (open-telemetry#4701)

mikeblum · Nov 9, 2023 · 7a53015 · 7a53015
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@@ -90,6 +90,8 @@ git push <YOUR_FORK> <YOUR_BRANCH_NAME>
 Open a pull request against the main `opentelemetry-go` repo. Be sure to add the pull
 request ID to the entry you added to `CHANGELOG.md`.
 
+To help facilitate reviewing and merging your PR, please refrain from force-pushing (`git push --force/-f`) or manually rebasing (`git rebase -i HEAD~1`). Re-writing history makes it difficult to keep track of iterations during code review. All PRs are automatically squashed down to a single commit upon merge to `main`.
+
 ### How to Receive Comments
 
 * If the PR is not ready for review, please put `[WIP]` in the title,