[FIX,DOC] Fixing problem with dox documentation in matrix_base.h.

git-svn-id: http://svn.seqan.de/seqan/trunk@14084 e6417c60-b987-48fd-844e-b20f0fcc1017
[DOC] Adding dox documentation for module arg_parse.

git-svn-id: http://svn.seqan.de/seqan/trunk@14085 e6417c60-b987-48fd-844e-b20f0fcc1017