FPHSA: detect package name mismatches

The `FPHSA_NAME_MISMATCHED` variable may be set if this is intentional
(but should be cleared after the call to not affect other FPHSA calls).
It may also be passed via the `NAME_MISMATCHED` option for new-signature
FPHSA calls.

Help/release/dev/fphsa-detect-name-mismatch.rst

@@ -0,0 +1,5 @@
+fphsa-name-mismatch
+-------------------
+
+* The :module:`FindPackageHandleStandardArgs` module learned to check the
+  package name passed in for typo mistakes.