[w3c/manifest] Scope matching algorithm: fix and explain (#590)

Fixes the definition of path matching (does not change behaviour) and adds an explanation.

Closes #554.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/590

-- Commit Summary --

  * Navigation scope: Avoid using pathname field.
  * Added a note explaining this strange behaviour.

-- File Changes --

    M index.html (19)

-- Patch Links --

https://github.com/w3c/manifest/pull/590.patch
https://github.com/w3c/manifest/pull/590.diff

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