Doc items breaking into groups by first sentence rather than alphabetically

[Chaosus]

Godot version:
3.1 - 3.2rc1

Issue description:
Looks like incorrect spacing where it shouldn't and not breaking where it should:

[Chaosus]

Ah, maybe it's just a matter of taste... They are grouped by first sub-sentence rather than alphabetically, which may be ok.

[mdante97]

Hi, I would like to take on this issue, but not exactly sure on how assigning these work. I would be happy in helping to sort out the doc items alphabetically.

[Calinou]

@mdante97 I think the current way of sorting is fine. It's already alphabetical, it just happens to group results by their first sub-sentence like distance or is_.

This issue can probably be closed.

[akien-mga]

I think the grouping by prefix similarity could simply be removed now. I assume it was done back in the days when we didn't have properties and had dozens of set_, get_ and is_ methods. This is no longer the case so I think the prefix grouping is rarely meaningful.

[Anukriti12]

Removing additional newline command in editor_help.cpp at line 655 (inside if condition) should do it.
I'm not sure how exactly should I make a pull request now that master branch is unstable (https://godotengine.org/article/headsup-vulkan-merged-master-branch-unstable)

[Calinou]

@Anukriti12 Feel free to open a pull request right away; you can rebase it in the future if it gets conflicts due to refactorings. I believe editor-related refactorings have mostly been completed by now (especially for parts that could affect the editor help).

[ChristopheLY]

@Anukriti12 without newline, it's hard to read and find a method when they are a lot.

[ChristopheLY]

something else, if we break by alphabetically the section Methods, we need to do the same for Properties which above Methods for the same reason

[Chaosus]

I think this looks okayish now (compared to the original screenshot):