Revisions for How to complete the LBTT lease review return forms

Updating line about submitting paper returns to RS instead of RoS, as requested by Erlend Barclay

Amendment of 'Submitting the return' section to include lines for arrangements to send paper returns to RS instead of RoS as requested by Chris Myerscough and Erlend Barclay.

Updated to point to guidance docs

Addition of message 'Please note this guidance has now been superseded following the SETS upgrade and will be updated as soon as possible' as requested by Ewan Matheison.

Updated with holding line on guidance - this guidance refers to an earlier version of our form. Approved by Alan Martin. Also updating URL.