docs: correct default in threadpool configuration
docs: correct default in threadpool configuration

puneetjaiswal/crate,puneetjaiswal/crate,crate/crate,adrpar/crate,gmrodrigues/crate,husky-koglhof/crate,puneetjaiswal/crate,adrpar/crate,aslanbekirov/crate,gmrodrigues/crate,EvilMcJerkface/crate,sunny256/crate,adrpar/crate,EvilMcJerkface/crate,husky-koglhof/crate,sunny256/crate,husky-koglhof/crate,aslanbekirov/crate,aslanbekirov/crate,gmrodrigues/crate,EvilMcJerkface/crate,crate/crate,sunny256/crate,crate/crate