Rollup merge of #33325 - birkenfeld:issue-31341, r=jseyfried

typeck: remove confusing suggestion for calling a fn type

* It is not clear what a "base function" is.
* The suggestion just adds parens, so suggests calling without args.

The second point could be fixed with e.g. `(...)` instead of `()`,
but the preceding "note: X is a function, perhaps you wish to call it"
should already be clear enough.

Fixes: #31341

src/test/compile-fail/issue-29124.rs

@@ -25,11 +25,7 @@ fn main() {
     obj::func.x();
     //~^ ERROR no method named `x` found for type `fn() -> ret {obj::func}` in the current scope
     //~^^ NOTE obj::func is a function, perhaps you wish to call it
-    //~^^^ HELP try calling the base function:
-    //~| SUGGESTION obj::func().x();
     func.x();
     //~^ ERROR no method named `x` found for type `fn() -> ret {func}` in the current scope
     //~^^ NOTE func is a function, perhaps you wish to call it
-    //~^^^ HELP try calling the base function:
-    //~| SUGGESTION func().x();
 }