Mahara manual for 19.04 has different opening sentance

Change-Id: I6372d71e8377ab7c100c2cad9885b54324e7fc66
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

test/behat/features/user_content/some_html.feature

@@ -37,5 +37,5 @@ Scenario:
     And I follow "mahara manual"
     And I wait "3" seconds
     And I switch to the new window
-    Then I should see "This is the user manual for Mahara"
+    Then I should see "This is the manual for Mahara"
     And I switch to the main window