chore: Fix typo in CONTRIBUTING.md (#2001)

Removes a hanging opening code block:

````
```suggestion
````
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Dheepak Krishnamurthy 2025-07-20 00:11:27 -04:00 committed by GitHub
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@ -61,7 +61,6 @@ to be installed when running rustfmt. You can install the nightly version of Rus
rustup install nightly
```
```suggestion
> [!IMPORTANT]
> Do not modify formatting configuration (`rustfmt.toml`, `.clippy.toml`) without
> prior discussion. These changes affect all contributors and should be carefully considered.