Rust

Minor spelling/grammar updates in egui_kittest's README #16721

Job	Run time
Check wasm32 + wasm-bindgen	5m 17s
Format + check	9m 5s
Check Windows	6m 12s
Check wasm32+atomics	2m 15s
android	1m 25s
ios	1m 16s
Run tests	7m 24s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-linux-gnu	44s
cargo-deny x86_64-pc-windows-msvc	37s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny aarch64-apple-darwin	40s
cargo-deny x86_64-apple-darwin	45s
cargo-deny i686-unknown-linux-gnu	43s
cargo-deny x86_64-unknown-redox	55s
cargo-deny x86_64-pc-windows-gnu	47s
cargo-deny aarch64-linux-android	46s
cargo-deny wasm32-unknown-unknown	44s
	41m 35s

Provide feedback