docs: Add note about small contributions

I saw this in the foundry docs and thought it would be good to add to ours
ethereum-optimism · Feb 11, 2023 · 97bd224 · 97bd224
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -2,6 +2,8 @@
 
 🎈 Thanks for your help improving the project! We are so happy to have you!
 
+**No contribution is too small and all contributions are valued.**
+
 There are plenty of ways to contribute, in particular we appreciate support in the following areas:
 
 - Reporting issues. For security issues see [Security policy](https://github.com/ethereum-optimism/.github/blob/master/SECURITY.md).