Updating SP Ad Groups to Version 3

[HamzaChx]

Updating the SP Ad Groups to Version 3 by adding the ad_groups_v3 file.
New Endpoints :
create_ad_groups()
edit_ad_groups()
delete_ad_groups()
list_ad_groups()

Also adding the changes to the docs files.

[denisneuf]

So damn fast, thank you bro!
I am working to try to generate the class and methods documentation with a python script, not sure if it worths or not, how do you think?

        Creates one or more ad groups.

        Request body: (required) An array of ad groups
            | **name** (*string*) : A name for the ad group
            | **campaignId**: (*string*) : An existing campaign to which the ad group is associated.
            | **defaultBid**: (*float*) A bid value for use when no bid is specified for keywords in the ad group
            | **state**: *string* A name for the ad group, Enum: [ enabled, paused, archived ]

        Returns:
            ApiResponse