Fix so the database setup description is compatible with MySQL 8 (#7340)

[ci skip]

CHANGELOG

@@ -2,6 +2,7 @@ CHANGELOG Roundcube Webmail
 ===========================
 
 - Fix bug in extracting required plugins from composer.json that led to spurious error in log (#7364)
+- Fix so the database setup description is compatible with MySQL 8 (#7340)
 
 RELEASE 1.4.4
 -------------

INSTALL

@@ -106,9 +106,9 @@ importing the table layout and granting the proper permissions to the
 roundcube user. Here is an example of that procedure:
 
 # mysql
-> CREATE DATABASE roundcubemail /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;
+> CREATE DATABASE roundcubemail CHARACTER SET utf8 COLLATE utf8_general_ci;
-> GRANT ALL PRIVILEGES ON roundcubemail.* TO roundcube@localhost
+> CREATE USER roundcube@localhost IDENTIFIED BY 'password';
-    IDENTIFIED BY 'password';
+> GRANT ALL PRIVILEGES ON roundcubemail.* TO roundcube@localhost;
 > quit
 
 # mysql roundcubemail < SQL/mysql.initial.sql