fix spawn docs examples

`v0.4.6`

`v0.4.5`

fix(counters_stable): intermittent closed target errors (leptos-rs#1240…

…) (leptos-rs#1243)

`v0.3.1`

cargo fmt

feat: `create_blocking_resource` (leptos-rs#752)

clippy: simplify Box::pin() call. (leptos-rs#718)

v0.2.2 (leptos-rs#667)

`v0.2.0`