Added change to migration doc

Author: sohaibiftikhar

docs/reference/migration/migrate_7_0/api.asciidoc

@@ -75,3 +75,7 @@ will be for such settings to be copied on such operations. To enable users in
 `copy_settings` parameter was added on the REST layer. As this behavior will be
 the only behavior in 8.0.0, this parameter is deprecated in 7.0.0 for removal in
 8.0.0.
+
+==== The deprecated stored script contexts have now been removed
+When putting stored scripts, support for storing them with the deprecated `template` context or without a context is
+now removed. Scripts must be stored using the `script` context as mentioned in the documentation.