[w3c/manifest] Fix related_applications parsing instructions (#933)

The instructions mentioned a src field which does not exist. Replace it with the id field.

This change (choose at least one, delete ones that don't apply):

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

Fix related_applications parsing instructions to refer to "id" instead of "src" (which doesn't exist).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/933

-- Commit Summary --

  * Fix related_applications parsing instructions

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/933.patch
https://github.com/w3c/manifest/pull/933.diff

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https://github.com/w3c/manifest/pull/933