Fix command line documentation for filter tool

The match command documentation currently asks for "document-origin"
but actually uses "document_origin", which is hard to recognize.

This CL fixes the documentation and also adds a more verbose error
for when the required arguments are not supplied.

Change-Id: Idd5f82a61f0628677f8f69633d3e783538a0c253
Reviewed-by: Josh Karlin <>
Commit-Queue: John Delaney <>
Cr-Commit-Position: refs/heads/master@{#741459}
1 file changed