Update plan template to document pkg_source as Optional
@@ -34,7 +34,7 @@ pkg_license={{ pkg_license }}
{{else ~}}
# pkg_license=('Apache-2.0')
{{/if}}
-# Required.
+# Optional.
# A URL that specifies where to download the source from. Any valid wget url
# will work. Typically, the relative path for the URL is partially constructed
# from the pkg_name and pkg_version values; however, this convention is not
