doc: dedupe links
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Replace some repeated full links with concise ones and bottom references.
(I've just checked /(\(http[^)]+\))(?=[\s\S]+?\1)/
and /(\([^)]+\.html[^)]*\))(?=[\s\S]+?\1)/
for the doc set, not sure if there are some more proper ways).