Note scope of TAIT more accurately
This maybe explains why the person was confused in #101897, since we say "same module" but really should've said "same impl".
r? ``@oli-obk``
In #102306, `rustc_typeck` was renamed to `rustc_hir_analysis` but the
diagnostic resources were not renamed - which is what this commit
changes.
Signed-off-by: David Wood <david.wood@huawei.com>