Update docs of each action to mention CLI call option (fastlane#14060)

This will make it easier to know that you can use call every fastlane action from the CLI also

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![screen shot 2019-01-14 at 11 29 06 am](https://user-images.githubusercontent.com/869950/51126089-45abfd00-17f0-11e9-9438-813770086310.png)

fastlane/lib/assets/ActionDetails.md.erb

@@ -50,12 +50,39 @@ Key | Description | Default
 <% end %><%# End of action.available_options... %>
 
 <hr />
+
+## Documentation
+
 To show the documentation in your terminal, run
 ```no-highlight
 fastlane action <%= action.action_name %>
 ```
 
-<a href="https://github.com/fastlane/fastlane/blob/master/fastlane/lib/fastlane/actions/<%= @action_filename %>" target="_blank">View source code</a>
+<hr />
+
+## CLI
+
+It is recommended to add the above action into your `Fastfile`, however sometimes you might want to run one-offs. To do so, you can run the following command from your terminal
+
+```no-highlight
+fastlane run <%= @action.action_name %>
+```
+
+To pass parameters, make use of the `:` symbol, for example
+
+```no-highlight
+fastlane run <%= @action.action_name %> parameter1:"value1" parameter2:"value2"
+```
+
+It's important to note that the CLI supports primative types like integers, floats, booleans, and strings. Arrays can be passed as a comma delimited string (e.g. `param:"1,2,3"`). Hashes are not currently supported.
+
+It is recommended to add all _fastlane_ actions you use to your `Fastfile`.
+
+<hr />
+
+## Source code
+
+This action, just like the rest of _fastlane_, is fully open source, <a href="https://github.com/fastlane/fastlane/blob/master/fastlane/lib/fastlane/actions/<%= @action_filename %>" target="_blank">view the source code on GitHub</a>
 
 <hr />