patch 8.2.0623: typo in test comment

Problem:    Typo in test comment. (Christ van Willegen)
Solution:   Avoid mixing up a data structure with a body part.

src/testdir/test_listdict.vim

@@ -547,7 +547,7 @@ func Test_dict_lock_extend()
   call assert_equal({'a': 99, 'b': 100}, d)
 endfunc
 
-" Cannot use += with a locked dick
+" Cannot use += with a locked dict
 func Test_dict_lock_operator()
   unlet! d
   let d = {}

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    623,
 /**/
     622,
 /**/