Doc: Drop parentheses and fifth macro argument in offline '\grid'

The parenthesis ends up without content, and that looks confusing and
broken in e.g. Qt Assistant.

Fixes: QTBUG-120151
Pick-to: 6.8.0 6.8
Change-Id: Ib616741bc0463e8bece481c2a37cd7c3992921ab
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

doc/global/grid.qdocconf

@@ -45,7 +45,7 @@ macro.detailedgriditem = \
 "  </li>\n" \
 "  \\endraw\n" \
 "\\else\n" \
-"  \\row \\li \\l {\1}{\2} \\li (\5) \3\n" \
+"  \\row \\li \\l {\1}{\2} \\li \3\n" \
 "\\endif\n"
 
 macro.endgrid = \