external: no argument(s)

Signed-off-by: Simon de Vlieger <[email protected]>

doc/03-omnifest/02-external.md

@@ -137,16 +137,14 @@ it finds the first match:
 - `/usr/lib/otk`
 
 The filename for an external executable is based on the external name. When the
-following directive is encountered: `otk.external.<name>.<argument>` then
+following directive is encountered: `otk.external.<name>` then
 `otk` will try to find an executable called `otk_external_<name>` in the previously
 mentioned search paths.
 
-It will call this executable with `<argument>` as its first argument. Here are
-some examples:
+Examples:
 
 - `otk.external.foo` -> `otk_external_foo`
-- `otk.external.foo.bar_baz` -> `otk_external_foo bar_baz`
-- `otk.external.foo.bar.baz` -> `otk_external_foo bar baz`
+- `otk.external.osbuild_bar` -> `otk_external_osbuild_bar`
 
 ## Implementations