Fix typo in command (#2601)

Fix typo in commands of example usage

Author: BioPhoton

@commitlint/cz-commitlint/README.md

@@ -51,9 +51,9 @@ echo "module.exports = {extends: ['@commitlint/config-conventional']};" > commit
 
 ```bash
 git add .
-npm run cz
+npm run commit
 # or yarn
-yarn cz
+yarn commit
 ```
 
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