fixed typo in group_concat printing (BUG#5161)

mysql-test/r/func_gconcat.result:
  fixed typo
sql/item_sum.cc:
  fixed typo

mysql-test/r/func_gconcat.result

@@ -18,7 +18,7 @@ explain extended select grp,group_concat(c) from t1 group by grp;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	Using filesort
 Warnings:
-Note	1003	select test.t1.grp AS `grp`,group_concat(test.t1.c seperator ',') AS `group_concat(c)` from test.t1 group by test.t1.grp
+Note	1003	select test.t1.grp AS `grp`,group_concat(test.t1.c separator ',') AS `group_concat(c)` from test.t1 group by test.t1.grp
 select grp,group_concat(a,c) from t1 group by grp;
 grp	group_concat(a,c)
 1	1a
@@ -93,7 +93,7 @@ explain extended select grp,group_concat(distinct c order by c desc) from t1 gro
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	Using filesort
 Warnings:
-Note	1003	select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c seperator ',') AS `group_concat(distinct c order by c desc)` from test.t1 group by test.t1.grp
+Note	1003	select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c separator ',') AS `group_concat(distinct c order by c desc)` from test.t1 group by test.t1.grp
 select grp,group_concat(c order by c separator ",") from t1 group by grp;
 grp	group_concat(c order by c separator ",")
 1	a
@@ -113,7 +113,7 @@ explain extended select grp,group_concat(distinct c order by c separator ",") fr
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	Using filesort
 Warnings:
-Note	1003	select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c seperator ',') AS `group_concat(distinct c order by c separator ",")` from test.t1 group by test.t1.grp
+Note	1003	select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c separator ',') AS `group_concat(distinct c order by c separator ",")` from test.t1 group by test.t1.grp
 select grp,group_concat(distinct c order by c desc separator ",") from t1 group by grp;
 grp	group_concat(distinct c order by c desc separator ",")
 1	a

sql/item_sum.cc

@@ -2157,7 +2157,7 @@ void Item_func_group_concat::print(String *str)
       (*order[i]->item)->print(str);
     }
   }
-  str->append(" seperator \'", 12);
+  str->append(" separator \'", 12);
   str->append(*separator);
   str->append("\')", 2);
 }