Add help for the following plugins (ref #903):

- Admin
- Alias
- AutoMode
- Channel
- ChannelLogger
- ChannelStats
- Conditional
- Config
- Ctcp
- Dict

- Also, proofread Aka's help from #904 for grammar.
Merge pull request #924 from GLolol/plugin-help-1

Add help for plugins from A-D (batch 1)