Update Petstore samples (#331)

* Grammar and spelling fixes

* update petstore samples

samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/ApiClient.java

@@ -897,7 +897,7 @@ public class ApiClient {
      * @param <T> Type
      * @param response Response
      * @param returnType Return type
-     * @throws ApiException If the response has a unsuccessful status code or
+     * @throws ApiException If the response has an unsuccessful status code or
      *   fail to deserialize the response body
      * @return Type
      */

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/ApiClient.java

@@ -897,7 +897,7 @@ public class ApiClient {
      * @param <T> Type
      * @param response Response
      * @param returnType Return type
-     * @throws ApiException If the response has a unsuccessful status code or
+     * @throws ApiException If the response has an unsuccessful status code or
      *   fail to deserialize the response body
      * @return Type
      */

samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php

@@ -223,7 +223,7 @@ class ObjectSerializer
      * @param string[] $httpHeaders   HTTP headers
      * @param string   $discriminator discriminator if polymorphism is used
      *
-     * @return object|array|null an single or an array of $class instances
+     * @return object|array|null a single or an array of $class instances
      */
     public static function deserialize($data, $class, $httpHeaders = null)
     {

samples/openapi3/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php

@@ -223,7 +223,7 @@ class ObjectSerializer
      * @param string[] $httpHeaders   HTTP headers
      * @param string   $discriminator discriminator if polymorphism is used
      *
-     * @return object|array|null an single or an array of $class instances
+     * @return object|array|null a single or an array of $class instances
      */
     public static function deserialize($data, $class, $httpHeaders = null)
     {

samples/server/petstore/springboot-beanvalidation/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/

samples/server/petstore/springboot-delegate-j8/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/

samples/server/petstore/springboot-delegate/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/

samples/server/petstore/springboot-implicitHeaders/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/

samples/server/petstore/springboot-reactive/README.md

@@ -8,6 +8,6 @@ This server was generated by the [OpenAPI Generator](https://openapi-generator.t
 By using the [OpenAPI-Spec](https://openapis.org), you can easily generate a server stub.
 This is an example of building a OpenAPI-enabled server in Java using the SpringBoot framework.
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 Change default port value in application.properties

samples/server/petstore/springboot-useoptional/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/

samples/server/petstore/springboot/README.md

@@ -10,7 +10,7 @@ This is an example of building a OpenAPI-enabled server in Java using the Spring
 
 The underlying library integrating OpenAPI to SpringBoot is [springfox](https://github.com/springfox/springfox)
 
-Start your server as an simple java application
+Start your server as a simple java application
 
 You can view the api documentation in swagger-ui by pointing to  
 http://localhost:80/