kamailio-kemi-framework: small update to kemix module description

kamailio-kemi-framework/docs/modules/kx/kx.header.md

@@ -1,3 +1,3 @@
-Functions exported by `kemix` module. They aim to provide a convenient way to
-retrieve string or integer values for most commonly used variables or runtime
-environment attributes.
+Functions exported by `kemix` module and available in KEMI language under
+`KSR.kx`. They aim to provide a convenient way to retrieve string or integer
+values for most commonly used variables or runtime environment attributes.