Fix typo in documentation
Provide more accurate error message
Revert "Improve suffix pattern check"

This reverts commit 3474afb165b6efa1a15db87c088e0fe79353000f.

Unfortunately this change is likely to cause issues for applications
that use regular expressions in a URI variable. I think we will have
to leave at: if there are any dots in the last segment of the
request path, regardless of whether they're in a URI var or not,
the suffix pattern match is off.

Issue: SPR-11532