docs/manual: fix scancpan path

scancpan is now in utils not in supports/scripts

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/manual/adding-packages-perl.txt

@@ -46,7 +46,7 @@ built.
 
 Most of these data can be retrieved from https://metacpan.org/.
 So, this file and the Config.in can be generated by running
-the script +supports/scripts/scancpan Foo-Bar+ in the Buildroot directory
+the script +utils/scancpan Foo-Bar+ in the Buildroot directory
 (or in a br2-external tree).
 This script creates a Config.in file and foo-bar.mk file for the
 requested package, and also recursively for all dependencies specified by