Extension documentation is misleading on hx-ext usage for sse and ws

[davewsmith]

Many of the extensions pages show in their Installation sections that hx-ext belongs on the body element. This isn't correct for the ws and sse extensions.

A simple fix is to remove mention hx-ext from the Installation sections, deferring to the correct examples in the Usage sections.

[MichaelWest22]

But without adding the extension to hx-ext attribute on body or some other lower element they will not function right?

[davewsmith]

It won't, and that's covered, completely (and in the case of sse and ws, correctly), in the Usage section of those pages.