spelling fixed/comments added (postreview fixes)

sql/mysqld.cc:
  spelling fixed
sql/sql_base.cc:
  spelling fixed
sql/sql_delete.cc:
  spelling fixed
sql/sql_parse.cc:
  comments added
sql/sql_prepare.cc:
  comments added
sql/sql_update.cc:
  spelling fixed
sql/sql_view.cc:
  spelling fixed
sql/table.cc:
  spelling fixed

sql/mysqld.cc

@@ -5287,7 +5287,7 @@ The minimum value for this variable is 4096.",
    (gptr*) &max_system_variables.trans_prealloc_size, 0, GET_ULONG,
    REQUIRED_ARG, TRANS_ALLOC_PREALLOC_SIZE, 1024, ~0L, 0, 1024, 0},
   {"updatable_views_with_limit", OPT_UPDATABLE_VIEWS_WITH_LIMIT,
-   "1 = YES = Don't issue an error message (warning only) if a VIEW without presence of a key of the underlaying table is used in queries with a LIMIT clause for updating. 0 = NO = Prohibit update of a VIEW, which does not contain a key of the underlying table and the query uses a LIMIT clause (usually get from GUI tools).",
+   "1 = YES = Don't issue an error message (warning only) if a VIEW without presence of a key of the underlying table is used in queries with a LIMIT clause for updating. 0 = NO = Prohibit update of a VIEW, which does not contain a key of the underlying table and the query uses a LIMIT clause (usually get from GUI tools).",
    (gptr*) &global_system_variables.updatable_views_with_limit,
    (gptr*) &max_system_variables.updatable_views_with_limit,
    0, GET_ULONG, REQUIRED_ARG, 1, 0, 1, 0, 1, 0},

sql/sql_base.cc

@@ -2815,7 +2815,7 @@ bool setup_tables(THD *thd, TABLE_LIST *tables, Item **conds,
   DBUG_ENTER("setup_tables");
   /*
     this is used for INSERT ... SELECT.
-    For select we setup tables except first (and its underlaying tables)
+    For select we setup tables except first (and its underlying tables)
   */
   TABLE_LIST *first_select_table= (select_insert ?
                                    tables->next_local:
@@ -3148,7 +3148,7 @@ insert_fields(THD *thd, TABLE_LIST *tables, const char *db_name,
       }
       /*
 	All fields are used in case if usual tables (in case of view used
-	fields merked in setu_tables during fix_fields of view columns
+	fields marked in setup_tables during fix_fields of view columns
       */
       if (table)
 	table->used_fields=table->fields;

sql/sql_delete.cc

@@ -374,7 +374,7 @@ bool mysql_multi_delete_prepare(THD *thd)
       Check are deleted table used somewhere inside subqueries.
 
       Multi-delete can't be constructed over-union => we always have
-      single SELECT on top and have to check underlaying SELECTs of it
+      single SELECT on top and have to check underlying SELECTs of it
     */
     for (SELECT_LEX_UNIT *un= lex->select_lex.first_inner_unit();
          un;

sql/sql_parse.cc

@@ -2883,11 +2883,13 @@ mysql_execute_command(THD *thd)
                                (ORDER *) select_lex->order_list.first,
                                select_lex->select_limit,
                                lex->duplicates));
+    /* mysql_update return 2 if we need to switch to multi-update */
     if (result != 2)
       break;
   case SQLCOM_UPDATE_MULTI:
     {
       DBUG_ASSERT(first_table == all_tables && first_table != 0);
+      /* if we switched from normal update, rights are checked */
       if (result != 2)
       {
         if ((res= multi_update_precheck(thd, all_tables)))

sql/sql_prepare.cc

@@ -1309,6 +1309,7 @@ static bool mysql_test_multiupdate(Prepared_statement *stmt,
 				  TABLE_LIST *tables,
                                   bool converted)
 {
+  /* if we switched from normal update, rights are checked */
   if (!converted && multi_update_precheck(stmt->thd, tables))
     return TRUE;
   /*
@@ -1457,6 +1458,7 @@ static int check_prepared_statement(Prepared_statement *stmt,
 
   case SQLCOM_UPDATE:
     res= mysql_test_update(stmt, tables);
+    /* mysql_test_update return 2 if we need to switch to multi-update */
     if (res != 2)
       break;
 

sql/sql_update.cc

@@ -720,7 +720,7 @@ bool mysql_multi_update_prepare(THD *thd)
 
       /*
         Multi-update can't be constructed over-union => we always have
-        single SELECT on top and have to check underlaying SELECTs of it
+        single SELECT on top and have to check underlying SELECTs of it
       */
       if (lex->select_lex.check_updateable_in_subqueries(tl->db,
                                                          tl->real_name))

sql/sql_view.cc

@@ -1046,7 +1046,7 @@ bool check_key_in_view(THD *thd, TABLE_LIST *view)
       if (i == elements_in_view)                // If field didn't exists
       {
         /*
-          Keys or all fields of underlaying tables are not foud => we have
+          Keys or all fields of underlying tables are not foud => we have
           to check variable updatable_views_with_limit to decide should we
           issue an error or just a warning
         */

sql/table.cc

@@ -1886,7 +1886,7 @@ int st_table_list::view_check_option(THD *thd, bool ignore_failure)
 
 
 /*
-  Find table in underlaying tables by mask and check that only this
+  Find table in underlying tables by mask and check that only this
   table belong to given mask
 
   SYNOPSIS