Fix the use of .ta macro
I am not sure the new syntax if the correct one. At least I do not have any warning using: $ MANROFFSEQ='' MANWIDTH=80 man --warnings -E UTF-8 -l -Tutf8 -Z vgrabbj.1 > /dev/null
Authored by: ludov 2013-09-04
Parent: [r201]
Child: [r203]
