Updated projection related documentation.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
7 jobs for enhancement/add_anyproj_compatibility in 4 minutes and 13 seconds (queued for 1 second)
Name Stage Failure
test_urls Test
No urls found.

Done. The following urls did not pass:
make: *** [Makefile:64: urlcheck] Error 1
Cleaning up file based variables
ERROR: Job failed: exit code 1