Spring Security Fix Documentation to Refer to BasicAuthenticationFilter

Summary

Here should be BasicAuthenticationFilter

Actual Behavior

Expected Behavior

Configuration

Version

5.3.1.BUILD-SNAPSHOT

Sample

Comment From: rwinch

Thanks for the report @beamerblvd Would you be interested in submitting a PR?

Comment From: dadikovi

Hi! This looks like an ideal very-first PR for me! I assume all the information I need for it is in the code of conduct and the contribution guide...