Update mods_here.txt to mention installing mods via CDB (#11876)

Co-authored-by: rubenwardy <rw@rubenwardy.com>

mods/mods_here.txt

@@ -1,4 +1,10 @@
+You can use the content tab in the main menu
+
+ OR
+
 You can install Minetest mods by copying (and extracting) them into this folder.
 To enable them, go to the configure world window in the main menu or write
+
   load_mod_<modname> = true
-in world.mt in the world directory.
+
+in world.mt in the world directory.