A long while back, work was done on the webapidocs Sphinx extension to

fix how URLs were generated for example payloads. This was done in

commit 527b0c461b.
That work regressed some of the behavior, and we never caught it until

now. The paths being built didn't include all components of the path.

There were also other issues from this change, like an attempt at

raising an exception that itself could crash.
This change fixes that path building, and also fixes a couple other

issues noted in the API:


The "HTTP Methods" text was no longer inlining content, causing the

   description for a method to be in its own paragraph. This is likely a

   regression due to a Sphinx or docutils change.


We were showing whether resources support anonymous access, a

   holdover from a very long time ago. This was misleading at best, as

   it determines this from the usage of decorators we no longer use, and

   doesn't factor in how access control actually works. This has been

   removed.


These changes will be backported to 4.0.

Built the documentation. Checked a variety of doc pages with different

levels of URL nesting, involving lists, items, and singletons. The URLs

were all correct.