more info on do NOT copy default config

src/config/config-template

@@ -12,6 +12,9 @@
 # Run `ghostty +show-config --default --docs` to view a list of
 # all available config options and their default values.
 #
+# Do not copy the output of the defaults into your config, like stated above
+# users only need to set options to change the defaults.
+#
 # Additionally, each config option is also explained in detail
 # on Ghostty's website, at https://ghostty.org/docs/config.
 #