[w3c/payment-handler] Broken references in Payment Handler API (Issue #402)

While crawling [Payment Handler API](https://w3c.github.io/payment-handler/), the following links to other specifications were detected as pointing to non-existing anchors, which should be fixed:
* [ ] https://www.w3.org/TR/appmanifest/#fetching-image-resources
* [ ] https://www.w3.org/TR/payment-request/#canmakepayment()-method
* [ ] https://www.w3.org/TR/payment-request/#show()-method
* [ ] https://www.w3.org/TR/service-workers/#service-worker-global-scope
* [ ] https://www.w3.org/TR/service-workers/#dfn-extend-lifetime-promises
* [ ] https://www.w3.org/TR/service-workers/#client-visibilitystate-attribute
* [ ] https://www.w3.org/TR/service-workers/#dfn-pending-promises-count
* [ ] https://www.w3.org/TR/service-workers/#dfn-uninstalling-flag

<sub>This issue was detected and reported semi-automatically by [Strudy](https://github.com/w3c/strudy/) based on data collected in [webref](https://github.com/w3c/webref/).</sub>

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