MDL-56240 upgrade: delete incorrect lines, manually added

Note that, with MDL-57266, we are changine the comment to be:

// Automatically generated Moodle v3.2.0 release upgrade line

in order to make to make to make it clearer that it's an
automatic (part of the release process) comment and should not
be added manually ever.

enrol/self/db/upgrade.php

@@ -39,9 +39,6 @@ function xmldb_enrol_self_upgrade($oldversion) {
     // Moodle v3.1.0 release upgrade line.
     // Put any upgrade step following this.
 
-    // Moodle v3.2.0 release upgrade line.
-    // Put any upgrade step following this.
-
     if ($oldversion < 2016052301) {
         global $DB;
         // Get roles with manager archetype.

mod/lti/db/upgrade.php

@@ -197,8 +197,6 @@ function xmldb_lti_upgrade($oldversion) {
     // Moodle v3.1.0 release upgrade line.
     // Put any upgrade step following this.
 
-    // Moodle v3.2.0 release upgrade line.
-    // Put any upgrade step following this.
     if ($oldversion < 2016052301) {
 
         // Changing type of field value on table lti_types_config to text.