Fix incorrect argument description on FnCtxt::resolve_ufcs

Author: jam1garner

compiler/rustc_typeck/src/check/method/mod.rs

@@ -469,14 +469,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Performs "universal function call" lookup. If lookup is successful, it will return the type
-    /// of definition and the [`DefId`] of the found definition.
+    /// of definition and the [`DefId`] of the found function definition.
     ///
     /// # Arguments
     ///
     /// Given a function call like `Foo::bar::<T1,...Tn>(...)`:
     ///
     /// * `self`:                  the surrounding `FnCtxt` (!)
-    /// * `span`:                  the span of the entire function call
+    /// * `span`:                  the span of the call, excluding arguments (`Foo::bar::<T1, ...Tn>`)
     /// * `method_name`:           the identifier of the function within the container type (`bar`)
     /// * `self_ty`:               the type to search within (`Foo`)
     /// * `expr_id`:               the [`hir::HirId`] of the expression composing the entire call