Mark places that would use XPath2.0+ features with TODO #2453
Description
Add a TODO referencing the XPath 2.0 issue?
Originally posted by @AshesITR in #2433 (comment)
Now that #2366 is filed, it's preferable for comments to point to that issue instead of vaguely refer to things about XPath1.0 vs 2.0. After #2149, this will also be a mechanism to ensure related issues are handled at the appropriate time, too.