BUG#37058855 Link to external blog returned in upgrade checker's scan

A doc link for zeroDates check pointed to an extenral log - replaced with proper mysql documentation links.

Change-Id: I5c6639a5d521fcabc8feb986f9fb1fd5de753af5

Author: Marek Młynarski

res/upgrade_checker/upgrade_checker.msg

@@ -238,7 +238,10 @@ https://mysqlserverteam.com/new-defaults-in-mysql-8-0/
 # may not work correctly in the future.
 
 * zeroDatesCheck.docLink
-https://lefred.be/content/mysql-8-0-and-wrong-dates/
+https://dev.mysql.com/doc/refman/8.0/en/datetime.html\n
+https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html#sqlmode_no_zero_date\n
+https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html#sqlmode_no_zero_in_date
+
 
 * schemaInconsistencyCheck.title
 # Schema inconsistencies resulting from file removal or corruption

unittest/modules/upgrade_check_t.cc

@@ -1027,8 +1027,12 @@ TEST_F(MySQL_upgrade_check_test, zero_dates_check) {
 
   PrepareTestDatabase("mysql_zero_dates_check_test");
   auto check = Sql_upgrade_check::get_zero_dates_check();
-  EXPECT_EQ(0, strcmp("https://lefred.be/content/mysql-8-0-and-wrong-dates/",
-                      check->get_doc_link()));
+  EXPECT_STREQ(
+      "https://dev.mysql.com/doc/refman/8.0/en/datetime.html\nhttps://"
+      "dev.mysql.com/doc/refman/8.0/en/"
+      "sql-mode.html#sqlmode_no_zero_date\nhttps://dev.mysql.com/doc/refman/"
+      "8.0/en/sql-mode.html#sqlmode_no_zero_in_date",
+      check->get_doc_link());
   EXPECT_NO_ISSUES(check.get());
 
   ASSERT_NO_THROW(