Update exercises/anagram/.meta/hints.md
Update exercises/anagram/.meta/hints.md

Co-Authored-By: Peter Goodspeed-Niklaus <dea3b09e269342fa2efe929fc2dabc7369dca99f@users.noreply.github.com>
exercism/xrust,petertseng/exercism-rust,petertseng/exercism-rust,petertseng/exercism-rust,exercism/xrust