Clarify type-specific lerp() documentation

[tetrapod00]

Addresses godotengine/godot-docs#10362.

I'm not 100% sure about this one.

For each type-specific lerp() or lerp() equivalent, except for Basis and Quaternion, add a line mentioning that weight can be with the range [0,1] or not, to perform either extrapolation or interpolation. Some of these descriptions had similar information already, in which case I removed that information in favor of this new line.

Each description also links to the GlobalScope lerp().

Because these are copypasta notes, I put them on a separate line and used generic phrasing so that it is a single string for translation (I think this works?).

The note is copied verbatim from the GlobalScope lerp(). Personally I think that the wording could be improved and made a bit more concise. If we do so, it should apply to all of these notes and also potentially to the GlobalScope lerp() as well.

[tetrapod00]

Suggested change

	To perform interpolation, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). However, values outside this range are allowed and can be used to perform [i]extrapolation[/i]. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].
	To interpolate, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). Values outside this range can be used to [i]extrapolate[/i] instead. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].

I was thinking of something like this to be more concise, but I'm open to any suggestions.

[Mickeon]

I'm fine with either way. However I think the "however" and "are allowed and" may not be necessary. It still reads fine as is, though.

[tetrapod00]

It's subtle, but I think "to interpolate" is better than "to perform interpolation", but "to perform extrapolation" is a little better than "to extrapolate". So I should probably leave this mostly as-is and just trim the extra words that you mentioned.

Suggested change

	To perform interpolation, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). However, values outside this range are allowed and can be used to perform [i]extrapolation[/i]. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].
	To perform interpolation, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). Values outside this range can be used to perform [i]extrapolation[/i] instead. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].

or maybe

Suggested change

	To perform interpolation, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). However, values outside this range are allowed and can be used to perform [i]extrapolation[/i]. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].
	To interpolate, [param weight] should be between [code]0.0[/code] and [code]1.0[/code] (inclusive). Values outside this range can be used to perform [i]extrapolation[/i] instead. If this is not desired, use [method @GlobalScope.clampf] to limit [param weight].