Add user and password to PDO_MYSQL DSN (#5706)

Author: kamil-tekiela

reference/pdo_mysql/reference.xml

@@ -104,6 +104,26 @@
         </para>
        </listitem>
       </varlistentry>
+      <varlistentry>
+       <term><literal>user</literal></term>
+       <listitem>
+        <simpara>
+         The name of the user for the connection. A user name given as the
+         second argument to the <classname>PDO</classname> constructor takes
+         precedence over one specified in the DSN.
+        </simpara>
+       </listitem>
+      </varlistentry>
+      <varlistentry>
+       <term><literal>password</literal></term>
+       <listitem>
+        <simpara>
+         The password of the user for the connection. A password given as the
+         third argument to the <classname>PDO</classname> constructor takes
+         precedence over one specified in the DSN.
+        </simpara>
+       </listitem>
+      </varlistentry>
       <varlistentry>
        <term><literal>unix_socket</literal></term>
        <listitem>