Doc contribution pr06
Documentation update fixing some of the methods with a PR06 error code which involved updating  

- string to str

- integer to int

- boolean to bool

No tests required

Thanks @tolaa001  These aren't all of the methods yet right? Do you know how many more still outstanding? @WillAyd no these are not all the methods. There are a few left and will continue to work through it in another PR :) Great thanks!

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> On Sep 27, 2019, at 10:02 AM, Tola A <notifications@github.com> wrote:
> 
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> @WillAyd no these are not all the methods. There are a few left and will continue to work through it in another PR :)
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