fix 'Did you mean' newlines

Author: dkuku

lib/elixir/lib/exception.ex

@@ -2242,7 +2242,7 @@ defmodule KeyError do
 
     case suggestions do
       [] -> []
-      suggestions -> [". Did you mean:\n\n" | format_suggestions(suggestions)]
+      suggestions -> ["\n\nDid you mean:\n\n" | format_suggestions(suggestions)]
     end
   end
 

lib/elixir/test/elixir/exception_test.exs

@@ -703,7 +703,9 @@ defmodule ExceptionTest do
       assert message == """
              key :firts not found in:
 
-                 %{first: nil, second: nil}. Did you mean:
+                 %{first: nil, second: nil}
+
+             Did you mean:
 
                    * :first
              """
@@ -749,7 +751,9 @@ defmodule ExceptionTest do
                    deleted_at: nil,
                    started_at: nil,
                    finished_at: nil
-                 ]. Did you mean:
+                 ]
+
+             Did you mean:
 
                    * :created_at
                    * :finished_at