Special thanks to Murch for teaching me mediawiki, and so much great
formatting and clarity advice.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
typos is a powerful source code spell checker.
Adds a CI job that runs on every PR and
push to master (but can also be run manually with
workflow_dispatch) that checks for typos.
Adds a config file .typos.toml that deals with
false positives and only checks for top-level/one-level
.mediawiki and .md files.
