Improve copy.

Co-authored-by: Jan Brašna <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
 <!--
-Thanks for contributing to _fastlane_! Before you submit your pull request, note that files in the docs folder covering Actions (actions.md and actions/*) and Plugins (available-plugins.md) are auto-generated.
-If this is the case, please modify the documentation at their sources (https://github.com/fastlane/fastlane or plugin repository) and it will be updated here regularly.
+Thanks for contributing to _fastlane_! Before you submit your pull request, note that files in the `/docs/generated` folder are auto-generated.
+If this is the case, please modify the documentation at its source (at https://github.com/fastlane/fastlane or plugin repository) and it will propagate here on regular basis.
 -->