[Docs] Fix alphabetical order of API lists

[koba04]

I suppose these API lists are sorting as alphabetical order, aren't they?
This PR is to fix the order.

BTW, Is the following list sorting as some intentional order?

http://airbnb.io/enzyme/docs/api/shallow.html#shallowwrapper-api

Thanks.

[ljharb]

I don't think either list is intended to be sorted in any particular order. I don't mind alphabetizing it, but I also don't think it matters - people will use "find in page" to find something specific, or will browse through them all.

[koba04]

I think ShallowWrapper API looks good to me.

But Table of Contents is cofusing because it's almost alphabetical order, and it's not same as ShallowWrapper API.
(ex. is(selector) and isEmpty() are not adjacent)

When I write tests with enzyme, I look for a suitable API in the API list of Table of Contents.
I think it would be nice if the list is sorted as some rule.

[blainekasten]

I am 👍 for alphabetical lists.

[blainekasten]

can you rebase this over master so we can merge it?

[koba04]

@blainekasten Thank you! Rebased!

[blainekasten]

Thank you @koba04 !

[koba04]

Thanks!