docs: IB recipe update for newer gnu variant: gnu7 -> gnu8
% ohpc_command fi
% ohpc_command if [[ ${enable_ib} -eq 1 ]];then
% ohpc_indent 5
-% ohpc_command (*\install*) ohpc-gnu7-mvapich2-parallel-libs
+% ohpc_command (*\install*) ohpc-gnu8-mvapich2-parallel-libs
% ohpc_indent 0
% ohpc_command fi
% ohpc_command if [[ ${enable_opa} -eq 1 ]];then
% ohpc_indent 5
-% ohpc_command (*\install*) ohpc-gnu7-mvapich2-parallel-libs
+% ohpc_command (*\install*) ohpc-gnu8-mvapich2-parallel-libs
% ohpc_indent 0
% ohpc_command fi
% end_ohpc_run
