api-get's help output showed that "--" was required before any query
arguments. This was probably true when we were using OptionParser, but
isn't either needed or supported now. Query arguments work just fine as
normal arguments. We can safely remove this misleading information from
the help.

Ran an api-get command without the extra "--". Worked.
Viewed the help and saw that the "--" was no longer shown as a requirement.
Built and viewed the updated docs.