Fix typos in contributing guide

[chenlichao]

Summary

• Fix two spelling errors in CONTRIBUTING.md: commiting → committing and overriden → overridden.

Why this helps

• Keeps contributor-facing setup and environment variable documentation polished and clear.
• Documentation-only change; no runtime behavior changes.

Test Plan

• git diff --check
• Manual review of the two-line documentation diff

Notes

• Commit includes the required DCO sign-off.

[chenlichao]

bumping for a first review when someone has a moment — docs-only typo fixes.

[chenlichao]

Weekly gentle bump — still hoping for a first review on these contributing-guide typo fixes. Docs-only, mergeable, happy to adjust anything.

[chenlichao]

Weekly bump — still no review on these contributing-guide typo fixes. Note the repo's CI reports no checks on this fork branch (known for external forks); docs-only and mergeable, happy to adjust anything.

[chenlichao]

Friendly ping for a first look — docs-only typo fixes in the contributing guide.

[chenlichao]

A gentle follow-up on the contributing-guide typo fixes. The branch is mergeable; GitHub currently reports no checks on this fork PR, so a maintainer review would help.

[chenlichao]

Check-in: CI is green and this still merges cleanly (typo fixes in the contributing guide only). Ready to merge whenever convenient.