docs(precommit): Ignore unknown files (#10634)
docs(precommit): Ignore unknown files (#10634)

Without `--ignore-unknown`, files without an extension or with an unknown extension would trigger the following error :
```
.gitignore[error] No parser could be inferred for file: ansible.cfg
```
prettier/prettier,rattrayalex/prettier,jlongster/prettier,prettier/prettier,prettier/prettier,rattrayalex/prettier,rattrayalex/prettier,prettier/prettier