Description of problem:

got me while wanting to disable a repo

    dnf config-manager
    (no answer)
    dnf config-manager --help
         --enablerepo [repo]
         --disablerepo [repo]
    (no detail on those two options, assume they do what I want)

the --help option, even displayed *after* the command name, will always show the general options. I found after that this the correct way to get help on a command:

    dnf help install

Also for config-manager this help is most unhelpful. In fact one would have to type

    dnf config-manager --help-cmd

to get the relevant options from config-manager

Currently on Fedora23 x86_64


Steps to Reproduce:
1. dnf config-manager --help is not helpful
2. dnf help config-manager is not helpful
3. dnf config-manager --help-cmd is never mentioned in dnf help page


Expected results:
--help option last line should be "Run dnf help command to get help on a command", at least if a command was specified

dnf help config-manager should give something meaningful


Additional info:
would it make sense to link to readthedocs.org in dnf output?