Update README API documentation reference

The README still pointed at the old Jekyll site's "API tab" nav
label. The new Hugo pill nav uses the "API documentation" label, so
update the README to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: oschwald

README.md

@@ -36,7 +36,7 @@ dependencies {
 ## API Documentation ##
 
 API documentation is viewable on our [GitHub
-Page](https://maxmind.github.io/minfraud-api-java/) under the API tab.
+Page](https://maxmind.github.io/minfraud-api-java/) and follow the "API documentation" link.
 
 ## Usage ##