Review docs

README.md

@@ -32,7 +32,7 @@ const logger = (call) => {
 
 const app = new Condor()
   .addService('./protos/greeter.proto', 'myapp.Greeter', new Greeter())
-  .addMiddleware('myapp', logger)
+  .addMiddleware(logger)
   .start();
 ```
 

docs/index.md

@@ -31,7 +31,7 @@ const logger = (call) => {
 
 const app = new Condor()
   .addService('./protos/greeter.proto', 'myapp.Greeter', new Greeter())
-  .addMiddleware('myapp', logger)
+  .addMiddleware(logger)
   .start();
 ```
 

docs/middleware.md

@@ -63,7 +63,7 @@ The execution flow can be controlled based on what the middleware method returns
 
 #### Do not affect the execution flow
 
-If the middleware method doesn't return anything, or if it returns a promise that resolves to `undefined`, the execution will continue normally.
+If the middleware method doesn't return anything, or if it returns a promise that resolves to any `falsy` value, the execution will continue normally.
 
 ```js
 const app = new Condor();
@@ -87,7 +87,7 @@ app.addMiddleware(scope, (call) => {
 
 #### Responding to the user
 
-If the middleware method returns **a value**, or a promise that **resolves to a value** (anything different than `undefined`), Condor will respond to the user with such value, interrupting the execution of the next middleware methods and the actual method implementation.
+If the middleware method returns **a value**, or a promise that **resolves to a value** (any `truthy` value), Condor will respond to the user with such value, interrupting the execution of the next middleware methods and the actual method implementation.
 
 ```js
 const app = new Condor();

docs/quick-start.md

@@ -78,7 +78,7 @@ Before start, we recommend you to get familiar with [GRPC](http://www.grpc.io/).
     var client = new greeterProto.myapp.Greeter('127.0.0.1:3000', grpc.credentials.createInsecure());
 
     function sayHello(person) {
-      client.sayHello(person, function(error, greeting) {
+      client.sayHello(person, (error, greeting) => {
         if (error) {
           console.log(error);
           return;