Fix Skeleton3D insert key tooltips

[skyace65]

Original text looks like it was written by someone in the middle of a stroke. This PR fixes that. Closes godotengine/godot-docs#8957

[hunterbk]

Does the button only key rotations, or also translations? If it's only rotations, that button was even more severely mislabeled than I originally thought

[fire]

I suspect something is wrong.

I think this refers to keyframes of loc,rot, and scale. Where does it say rotation only?

[skyace65]

@fire both buttons only work for rotation, I tested that before making this PR. If they're intended to keyframe position and scale as well that's currently broken in 4.2.1. Here's a video of me using the buttons.
Button Test.zip

[fire]

In your video the button for rotation was selected, did you try selecting the other buttons (next to it).

[skyace65]

You were right Fire, I completely forgot about those buttons. I've updated this PR but I'd like to re-word it further tomorrow. I want to try and keep the description consistent with what we use for the key button in the toolbar for 2D scenes.

[skyace65]

Updated description again, ready for review again.

[akien-mga]

Needs rebase.

Edit: Rebased myself.

Changes done.

[akien-mga]

Thanks!