Improve docs for -d. (#1750)
Improve docs for -d. (#1750)

As mentioned in #1749, this commit brings the docs up to date with the man page
and usage statement.

Fixes #1749.
hillu/yara,VirusTotal/yara,wxsBSD/yara,hillu/yara,hillu/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara,wxsBSD/yara,wxsBSD/yara,VirusTotal/yara,VirusTotal/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara