Improved geometry docs

[itzpr3d4t0r]

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This PR tries to simplify and improve geometry docs a bit.

What I tried to achieve:

• Lessen word repetition
• Remove obvious statements
• Remove self references when describing methods (like saying: "The collidecircle method does ..." inside the collidecircle 's docs)
• Uniform collision / overlap / intersect / tests / checks word usage
• Moved Circle.move() docs from between collision methods to under collision methods
• Shorten phrases a bit
• Use of actual math formulas syntax