fix workers doc

actix-web/MIGRATION-4.0.md

@@ -139,3 +139,7 @@ TODO
 ## HttpResponse no longer implements Future
 
 TODO
+
+## `#[actix_web::main]` and `#[tokio::main]`
+
+TODO

actix-web/src/server.rs

@@ -128,7 +128,7 @@ where
 
     /// Set number of workers to start.
     ///
-    /// By default, server uses number of available logical CPU as thread count.
+    /// By default, the number of available physical CPUs is used as the worker count.
     pub fn workers(mut self, num: usize) -> Self {
         self.builder = self.builder.workers(num);
         self