[5.8] Sort helper methods alphabetically

[fitztrev]

The "Array & Objects" and "Paths" sections are sorted alphabetically, but Strings was not. Also fixed a couple in the other sections.

[imliam]

It would be nice if the actual helper methods on the page were sorted too, not just the list at the top of the page.

[fitztrev]

If a maintainer tells me it will be accepted, I'll do it. But the diff would look confusing so I didn't do it initially.

[taylorotwell]

Yeah I agree it would be kinda nice.

[fitztrev]

Done

[taylorotwell]

Thanks