fix some typos

Author: findleyr

mcp/features.go

@@ -18,7 +18,7 @@ import (
 // Every feature has a unique ID, and the spec never mentions
 // an ordering for the List calls, so what it calls a "list" is actually a set.
 //
-// An alternative implementation would use an ordered map, but that's probable
+// An alternative implementation would use an ordered map, but that's probably
 // not necessary as adds and removes are rare, and usually batched.
 type featureSet[T any] struct {
 	uniqueID   func(T) string