Adding docs for VectorScene and LinearTransformationScene and reimplementing method#3681

SirJamesClarkMaxwell wants to merge 4 commits intoManimCommunity:mainManimCommunity/manim:mainfrom

SirJamesClarkMaxwell:VectorScene-fixingBugs-docsSirJamesClarkMaxwell/manim:VectorScene-fixingBugs-docsCopy head branch name to clipboard