Here's my best attempt at resolving #1586.

I've added a new section to the authoring spec specifically dealing with fragment identifiers and have linked down to it from the textref and src attributes.

I've specified that authors should reference a target element or use an svg fragid, but may use other schemes (noting that support is not required).

In the reading system specification, I've made the recommendation to ensure the element is visible contingent on one of the above two fragment identifier schemes being used.

Otherwise, I've made some minor cleanup to ensure we're not being too element-specific when talking about the fragments (plus some general cleanup since I was reading through the sections anyway).

Fully expect this will need some more tweaking, though. I'll add a change log entry once it's clear what we're settling on.

Fixes #1586

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