index: formatting issues

[sdutoit]

Via cxxeditor@:

Finally, I noted a very minor typographical issue: There seems to be
a space missing after "see" in the index entry for
"conditionally-supported behavior". I also suspect there shouldn't be a
page entry here, given that it's a cross-reference to another entry.
(Besides, the page number is wrong.) [Hmmm; I now see this entry is
generated via an \indexdefn macro call; perhaps it should be an
\indextext call instead?]

[tkoeppe]

This seems to have been fixed; we've had a bunch of index fix commits recently.

[cpplearner]

Appears to be fixed by e525c60.