The most useful way to view the TPL documentation is to export a PDF of the document.
1) find the doc: https://docs.bmc.com/docs/display/DISCO110/The+Pattern+Language+TPL
2) Click the "gear", and choose "Export to PDF"
In the 10.0 documention, the PDF's were already exported: Export PDF Pages - BMC Discovery 10.0 - BMC Documentation
See this for the PDF document from 10.0: TPL Guide PDF - BMC Discovery 10.0 - BMC Documentation
But, newer versions of the doc do not have the PDF's... you have to export them yourself.
This doc explains how to create your own PDF's : Exporting to PDF and other formats - Help for BMC Online Technical Documentation