unlink: prefer "symlinks" since that's how it is reported by link

cf. Homebrew/homebrew#28244.

Library/Homebrew/cmd/unlink.rb

@@ -6,7 +6,7 @@ module Homebrew extend self
       keg.lock do
         print "Unlinking #{keg}... "
         puts if ARGV.verbose?
-        puts "#{keg.unlink} links removed"
+        puts "#{keg.unlink} symlinks removed"
       end
     end
   end