doc/langref.html.in: update suspend example with @handle();
doc/langref.html.in: update suspend example with @handle();

Tracking Issue #1296 ;

Dimenus/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,Dimenus/zig,zig-lang/zig,Dimenus/zig,raulgrell/zig,zig-lang/zig