update outdated comment

src/librustc_typeck/constrained_generic_params.rs

@@ -36,7 +36,7 @@ pub fn parameters_for_impl<'tcx>(
     vec.into_iter().collect()
 }
 
-/// If `include_projections` is false, returns the list of parameters that are
+/// If `include_nonconstraining` is false, returns the list of parameters that are
 /// constrained by `t` - i.e., the value of each parameter in the list is
 /// uniquely determined by `t` (see RFC 447). If it is true, return the list
 /// of parameters whose values are needed in order to constrain `ty` - these