docs: encourage using the "setup" subcommand where appropriate
@@ -113,7 +113,7 @@ All other combinations of `debug` and `optimization` set `buildtype` to `'custom
These are set in the same way as universal options, either by
`-Doption=value`, or by setting them inside `default_options` of
[[project]] in your `meson.build`. However, they cannot be shown in
-the output of `meson --help` because they depend on both the current
+the output of `meson setup --help` because they depend on both the current
platform and the compiler that will be selected. The only way to see
them is to setup a builddir and then run `meson configure` on it with
no options.
