improve installation type instructions in auto-resize test

[Yousuf 'Jay' Philips]

In the 'Install (auto-resize)' testcase the instructions in steps 7 and 8 should be improved

- before -

7. Click on Continue
    The Screen Install Xubuntu XX.XX alongsite SYSTEM YY appears
8. Note the drive selected on the Select drive list and the bar state
If the target drive has a free partition with sufficient freespace, install will proceed without further partitioning intervention
    The drive corresponds to the drive on the chart (e.g /dev/sda) and the bar is divided

- after -

7. Click on 'Continue' or 'Install Now' button
    If you clicked 'Continue', then the Screen Install Xubuntu XX.XX alongsite SYSTEM YY appears, and continue with step 8
    If you clicked 'Install Now', your target drive has a free partition with sufficient freespace, so then jump to step 11
8. Note the drive selected on the Select drive list and the bar state
    The drive corresponds to the drive on the chart (e.g /dev/sda) and the bar is divided

http://iso.qa.ubuntu.com/qatracker/testcases/1301/info