chore: remove dead documentation reference to clang formatter (#1547)

Author: andrewseguin

CONTRIBUTING.md

@@ -150,8 +150,7 @@ To ensure consistency throughout the source code, keep these rules in mind as yo
 * All features or bug fixes **must be tested** by one or more specs (unit-tests).
 * All public API methods **must be documented**. (Details TBD).
 * We follow [Google's JavaScript Style Guide][js-style-guide], but wrap all code at
-  **100 characters**. An automated formatter is available, see
-  [DEVELOPER.md](DEVELOPER.md#clang-format).
+  **100 characters**.
 
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