Minor change: update projectors doc.

gen_doc/CMakeLists.txt

gen_doc/filterout_excluded_classes.py

wrapper/matlab/+matfaust/+proj/@const/const.m

wrapper/matlab/+matfaust/+proj/@normcol/normcol.m

wrapper/matlab/+matfaust/+proj/@normlin/normlin.m

wrapper/matlab/+matfaust/+proj/@sp/sp.m

wrapper/matlab/+matfaust/+proj/@spcol/spcol.m

wrapper/matlab/+matfaust/+proj/@splin/splin.m

wrapper/matlab/+matfaust/+proj/@splincol/splincol.m

wrapper/matlab/+matfaust/+proj/@supp/supp.m