Update CONTRIBUTING.md

Author: sidharthv96

CONTRIBUTING.md

@@ -72,6 +72,7 @@ Documentation is necessary for all non bugfix/refactoring changes.
 Only make changes to files that are in [`/packages/mermaid/src/docs`](packages/mermaid/src/docs)
 
 **_DO NOT CHANGE FILES IN `/docs` MANUALLY_**
+
 The `/docs` folder will be rebuilt and committed as part of a pre-commit hook.
 
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