flash shortcut descriptions

lua/plugins/flash.lua

@@ -20,6 +20,7 @@ return {
         -- default options: exact mode, multi window, all directions, with a backdrop
         require('flash').jump()
       end,
+      desc = 'Flash jump'
     },
     {
       'S',
@@ -27,6 +28,7 @@ return {
       function()
         require('flash').treesitter()
       end,
+      desc = 'Flash treesitter'
     },
   },
 }