docs: remove excessive dot in CONTRIBUTING.md (#880)

Removing one unnecessary dot in `create-react-native-library` template
`CONTRIBUTING.md`.
Biggest open source contribution in history of open source
contributions..

Author: descorp

packages/create-react-native-library/templates/common/CONTRIBUTING.md

@@ -110,7 +110,7 @@ We follow the [conventional commits specification](https://www.conventionalcommi
 - `fix`: bug fixes, e.g. fix crash due to deprecated method.
 - `feat`: new features, e.g. add new method to the module.
 - `refactor`: code refactor, e.g. migrate from class components to hooks.
-- `docs`: changes into documentation, e.g. add usage example for the module..
+- `docs`: changes into documentation, e.g. add usage example for the module.
 - `test`: adding or updating tests, e.g. add integration tests using detox.
 - `chore`: tooling changes, e.g. change CI config.