docs: update docs/faq.md

docs/faq.md

@@ -15,7 +15,7 @@ You can reinstall it using 'npm install husky --save-dev' or delete this hook
 
 Ensure that your node and git versions satisfy the above requirements. You can check this by running `git --version` and `node --version` from your terminal.
 
-# What does an Error and Warnings mean?
+# What does Error and Warning mean?
 
 `d2-style` is strict by default, as it tries to guard against known lint
 from entering the codebase. If the lint is denied early, it is easier,