Fix typo in javascript generator template (#3249)

* Fix typo in javascript generator template

* Update sample client

samples/openapi3/client/petstore/javascript-es6/README.md

@@ -14,8 +14,7 @@ This SDK is automatically generated by the [OpenAPI Generator](https://openapi-g
 
 #### npm
 
-To publish the library as a [npm](https://www.npmjs.com/),
-please follow the procedure in ["Publishing npm packages"](https://docs.npmjs.com/getting-started/publishing-npm-packages).
+To publish the library as a [npm](https://www.npmjs.com/), please follow the procedure in ["Publishing npm packages"](https://docs.npmjs.com/getting-started/publishing-npm-packages).
 
 Then install it via:
 
@@ -23,10 +22,41 @@ Then install it via:
 npm install open_api_petstore --save
 ```
 
+Finally, you need to build the module:
+
+```shell
+npm run build
+```
+
+##### Local development
+
+To use the library locally without publishing to a remote npm registry, first install the dependencies by changing into the directory containing `package.json` (and this README). Let's call this `JAVASCRIPT_CLIENT_DIR`. Then run:
+
+```shell
+npm install
+```
+
+Next, [link](https://docs.npmjs.com/cli/link) it globally in npm with the following, also from `JAVASCRIPT_CLIENT_DIR`:
+
+```shell
+npm link
+```
+
+To use the link you just defined in your project, switch to the directory you want to use your open_api_petstore from, and run:
+
+```shell
+npm link /path/to/<JAVASCRIPT_CLIENT_DIR>
+```
+
+Finally, you need to build the module:
+
+```shell
+npm run build
+```
+
 #### git
-#
-If the library is hosted at a git repository, e.g.
-https://github.com/GIT_USER_ID/GIT_REPO_ID
+
+If the library is hosted at a git repository, e.g.https://github.com/GIT_USER_ID/GIT_REPO_ID
 then install it via:
 
 ```shell
@@ -139,10 +169,12 @@ Class | Method | HTTP request | Description
  - [OpenApiPetstore.ArrayTest](docs/ArrayTest.md)
  - [OpenApiPetstore.Capitalization](docs/Capitalization.md)
  - [OpenApiPetstore.Cat](docs/Cat.md)
+ - [OpenApiPetstore.CatAllOf](docs/CatAllOf.md)
  - [OpenApiPetstore.Category](docs/Category.md)
  - [OpenApiPetstore.ClassModel](docs/ClassModel.md)
  - [OpenApiPetstore.Client](docs/Client.md)
  - [OpenApiPetstore.Dog](docs/Dog.md)
+ - [OpenApiPetstore.DogAllOf](docs/DogAllOf.md)
  - [OpenApiPetstore.EnumArrays](docs/EnumArrays.md)
  - [OpenApiPetstore.EnumClass](docs/EnumClass.md)
  - [OpenApiPetstore.EnumTest](docs/EnumTest.md)
@@ -165,6 +197,7 @@ Class | Method | HTTP request | Description
  - [OpenApiPetstore.Model200Response](docs/Model200Response.md)
  - [OpenApiPetstore.ModelReturn](docs/ModelReturn.md)
  - [OpenApiPetstore.Name](docs/Name.md)
+ - [OpenApiPetstore.NullableClass](docs/NullableClass.md)
  - [OpenApiPetstore.NumberOnly](docs/NumberOnly.md)
  - [OpenApiPetstore.Order](docs/Order.md)
  - [OpenApiPetstore.OuterComposite](docs/OuterComposite.md)
@@ -182,32 +215,40 @@ Class | Method | HTTP request | Description
 ## Documentation for Authorization
 
 
+
 ### api_key
 
+
 - **Type**: API key
 - **API key parameter name**: api_key
 - **Location**: HTTP header
 
 
+
 ### api_key_query
 
+
 - **Type**: API key
 - **API key parameter name**: api_key_query
 - **Location**: URL query string
 
 
+
 ### bearer_test
 
 - **Type**: Bearer authentication (JWT)
 
 
+
 ### http_basic_test
 
 - **Type**: HTTP basic authentication
 
 
+
 ### petstore_auth
 
+
 - **Type**: OAuth
 - **Flow**: implicit
 - **Authorization URL**: http://petstore.swagger.io/api/oauth/dialog