Fix documentation set_controller
The documentation for the `set_controller` function was copied from the function above it, however it does not do the same thing. Fixed the documentation to fit the correct description of what `set_controller` does.
@@ -952,7 +952,7 @@ decl_module! {
<Payee<T>>::insert(stash, payee);
}
- /// (Re-)set the payment target for a controller.
+ /// (Re-)set the controller of a stash.
///
/// Effects will be felt at the beginning of the next era.
///
