Docs: Fix link in handlebars text field API

Currently, this link was returning a 404 response. It should be
relative to the /api/classes path. This change fixes the link.
[DOC] What a Hampster is?
[BUGFIX beta] Enumerable#any no longer returns false if NaN is matched

Fixes #3736
Merge pull request #3735 from thenickcox/fix_handlebars_link

Docs: Fix link in handlebars text field API