Typo in API documentation #1406

[NikolaDojic]

Summary

Proposed change:

on page: https://mozilla.github.io/nunjucks/api.html

the system will automatically update templates. To use watch, make sure optional dependency chokidar is installed. when they are changed on the filesystem

change to:

the system will automatically update templates when they are changed on the filesystem. To use watch, make sure optional dependency chokidar is installed.

Closes #1406.

Checklist

I've completed the checklist below to ensure I didn't forget anything. This makes reviewing this PR as easy as possible for the maintainers. And it gets this change released as soon as possible.

• Proposed change helps towards purpose of this project.
• Documentation is added / updated to describe proposed change.
• Tests are added / updated to cover proposed change.
• Changelog has an entry for proposed change (if user-facing fix or feature).