edits to hp-lefthand-driver.xml

removed . which was extra after snapshots
added hyphen in back-end for consistency with rest of doc
added hyphen in key-values for consistency with rest of doc
removed . after for prior to listing items

Change-Id: Id64e9bc1fb15ef019dc75b660484bcaede1a7a21
Merge "edits to hp-lefthand-driver.xml"