docs: Improve docs for `Point` and `Vec2` (#363) #568

Job	Run time
cargo fmt	20s
cargo check (msrv) (wasm32)	21s
cargo check (msrv) (windows-latest)	52s
cargo clippy (windows-latest)	1m 5s
cargo check (msrv) (macos-latest)	37s
cargo clippy (wasm32)	46s
cargo clippy (macos-latest)	36s
cargo check (msrv) (ubuntu-latest)	23s
cargo doc	17s
cargo clippy (ubuntu-latest)	45s
cargo test (windows-latest)	39s
cargo test (wasm32)	22s
cargo test (macos-latest)	25s
typos	3s
cargo test (ubuntu-latest)	24s
	7m 55s

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