Fix uitests

Author: JonathanBrouwer

tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.stderr

@@ -35,12 +35,6 @@ help: the nightly-only, unstable trait `IntoDiagArg` is not implemented for `Not
 LL | struct NotIntoDiagArg;
    | ^^^^^^^^^^^^^^^^^^^^^
    = help: normalized in stderr
-note: required by a bound in `Diag::<'a, G>::arg`
-  --> $COMPILER_DIR/rustc_errors/src/diagnostic.rs:LL:CC
-  ::: $COMPILER_DIR/rustc_errors/src/diagnostic.rs:LL:CC
-   |
-   = note: in this macro invocation
-   = note: this error originates in the macro `with_fn` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors