Rust

Use the short `eframe::Result` in all examples #11785

Job	Run time
Check wasm32 + wasm-bindgen	3m 11s
android	35s
Format + check + test	6m 0s
cargo-deny aarch64-apple-darwin	39s
cargo-deny aarch64-linux-android	39s
Check Windows	1m 36s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny i686-unknown-linux-gnu	41s
cargo-deny wasm32-unknown-unknown	39s
cargo-deny x86_64-apple-darwin	40s
cargo-deny x86_64-pc-windows-gnu	40s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	37s
	19m 11s

Provide feedback