Vector3.slide() needs expansion.

[esklarski]

Your Godot version:
4.1

Issue description:
I'm new to Godot and was thrown for a loop re Vector3.project() not doing what I expected. As per this issue it turns out I wanted the rejection vector, provided by Vector3.slide() but "slide" is a unique name for this function.

Not wanting to propose breaking changes, I'd rather update the class manual to clarify these two methods.

I'm thinking something like:

Vector3.slide(n:Vector3): Returns a new vector slid (or projected) along a plane defined by the given normal. Also known as the rejection vector. Returns component perpendicular to [ n ]. See also: [Vector3.project]

Vector3.project(b:Vector3): Returns the result of projecting the vector onto the given vector [ b ]. Returns component parellel to [ b ]. See also: [Vector3.slide]

I am working on making a fork and changes but thought I'd start by discussing the text.

URL to the documentation page (if already existing):
Manual: Vector3 Class Manual
git: Vector3 Class xml

Changes to class xml:

<method name="slide" qualifiers="const">
	<return type="Vector3" />
	<param index="0" name="n" type="Vector3" />
	<description>
		Returns a new vector slid (or projected) along a plane defined by the given normal. Also known as the `rejection` vector. Returns component perpendicular to [param n].[br]See also: [method Vector3.project]
	</description>
</method>

<method name="project" qualifiers="const">
	<return type="Vector3" />
	<param index="0" name="b" type="Vector3" />
	<description>
		Returns the result of projecting the vector onto the given vector [param b]. Returns component parellel to [param b].[br]See also: [method Vector3.slide]
	</description>
</method>