fix(cmd/helm): update helm commands usage text to reflect current

[fibonacci1729]

At least one cmd (helm list) indicates usage of flags, such as '-l', in the usage help text with no support.

If an argument is provided, it will be treated as a filter. Filters are
regular expressions (Perl compatible) that are applied to the list of releases.
Only items that match the filter will be returned.

    $ helm list -l 'ara[a-z]+'
    NAME                UPDATED                     CHART
    maudlin-arachnid    Mon May  9 16:07:08 2016    alpine-0.1.0

If no results are found, 'helm list' will exit 0, but with no output (or in
the case of '-l', only headers).

> helm list -l 'ara[a-z]+'
Error: unknown shorthand flag: 'l' in -l

This should be updated to remove the reference to '-l' or provide the support as necessary.

[technosophos]

Oh, good catch. -l, --long was made the default, and -q, --short is now the opposite.