doc(readme): sync api

Author: arlac77

README.md

@@ -49,17 +49,21 @@ Returns **[number](https://developer.mozilla.org/docs/Web/JavaScript/Reference/G
 
 ### endpointParentSeparator
 
-Returns **[string](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** separator between step name and endpoint name
+separator between step name and endpoint name
+
+Returns **[string](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** '/'
 
 ### log
 
-adds 'step-type' and 'step-name'
+adds 'step-type' and 'step-name' to the log event
 
 **Parameters**
 
 -   `level`  
 -   `arg`  
 
+Returns **[undefined](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/undefined)** 
+
 ### name
 
 Returns **[string](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** 'kronos-step'

src/step.js

@@ -34,14 +34,16 @@ export class Step extends Service {
   }
 
   /**
-   * @return {string} separator between step name and endpoint name
+   * separator between step name and endpoint name
+   * @return {string} '/'
    **/
   get endpointParentSeparator() {
     return '/';
   }
 
   /**
-   * adds 'step-type' and 'step-name'
+   * adds 'step-type' and 'step-name' to the log event
+   * @return {undefined}
    **/
   log(level, arg) {
     this.endpoints.log.receive(