docs: supply correct manifest.webmanifest filename

[jorroll]

Previously, the docs incorrectly identified the generated manifest file as "manifest.json" when it is actually "manifest.webmanifest".

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit

PR Type

What kind of change does this PR introduce?

• Documentation content changes

What is the current behavior?

Currently the docs incorrectly reference the generated service worker manifest file as "manifest.json" when it is actually named "manifest.webmanifest".

What is the new behavior?

Now, the docs correctly reference the generated service worker manifest file as "manifest.webmanifest"

Does this PR introduce a breaking change?

• No

Other information

[gkalpak]

Good catch! Thx 👍

For future PRs, try to use the correct commit message scope (see here for details) for docs commits. E.g. this one should have been docs(service-worker): ....

[jorroll]

I had mistakenly just read the text between the "Commit Message Format" and "Revert" headers and thought that, since the scope was described as optional, I could just leave it out.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}