release notes typo

Author: andrew-platt

docs/changelogs/v4.2.1.md

@@ -64,7 +64,7 @@ We are grateful for a first time code contributions from @IrisMeasure.
 
 ## Solvers
 
-### OpenFAST
+### FAST.Farm
 
 #3243 Add high res windslice at `T=t_low - DT_high` (Fix for FAST.Farm issue #3183) (@andrew-platt)