Some of our custom code was missing XML documentation, partly because we
didn't realize that the publishing system for docs.microsoft.com does not
support <inheritdoc/>. These changes were originally applied on the
search-preview branch and are being re-applied here.

Somehow a test stopped working in playback mode, possibly due to changes in
how TestFramework handles generated names. This was easily fixed by
re-recording the session record for the test.

There are no code changes in this release, but there are doc changes and we'd
rather ship them now than wait for the next set of code changes.

…sprojs