* esp-wifi uses global allocator, esp-alloc supports multiple regions
* CHANGELOG.md
* Apply suggestions
* Use `alloc` when linting esp-wifi
* Make coex example build for ESP32
* Re-enable some wifi examples for ESP32-S2
* Optionally depend on `esp-alloc` (by default)
* Rename INSTANCE -> HEAP
* Check docs examples II
* rebase and update
* fix root crate macro expansion in doctest snippets
* clean up and fmt
* add xtask run-doc-test subcommand and check in CI
* address review comments
* remove commented printlns
* fix the host target check
* rebase and update
* hide docs for before_snippet macro and remove commented block code in twai
