doc: move joshgav to TSC emeriti list
Josh is focusing on other technologies these days and has moved to the TSC Emeritus role. He already opened a pull request in the TSC repository to make this change. This makes the same change in the main repository.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc