hyprctl: add --quiet flag (#6380)

hyprctl/Strings.hpp

@@ -60,6 +60,7 @@ flags:
     --batch             → Execute a batch of commands, separated by ';'
     --instance (-i)     → use a specific instance. Can be either signature or
                           index in hyprctl instances (0, 1, etc)
+    --quiet (-q)        → Disable the output of hyprctl
 
 --help:
     Can be used to print command's arguments that did not fit into this page
@@ -155,4 +156,4 @@ cmd:
     starting from 0
 
 flags:
-    See 'hyprctl --help')#";
+    See 'hyprctl --help')#";