CAP LETTER -Update CONTRIBUTING.md

[pucedoteth]

Grammatically, first letter always capital. I know its a very small contribution but its good for visibility.

Motivation

Closes #

Changes

Test Plan

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed

DevOps Notes

• This PR does not require configuration changes (e.g., environment variables, GitHub secrets, VM resources)
• This PR does not affect public APIs
• This PR does not rely on a new version of external services (PoET, elasticsearch, etc.)
• This PR does not make changes to log messages (which monitoring infrastructure may rely on)