Correct spelling and grammar in error messages

src/OpenID/AbstractProvider.php

@@ -220,6 +220,6 @@ protected function createConsumer(array $parameters): Consumer
      */
     public function createAccessToken(array $information)
     {
-        throw new Unsupported('It\'s usefull to use this method for OpenID, are you sure?');
+        throw new Unsupported('It\'s useful to use this method for OpenID, are you sure?');
     }
 }

src/OpenIDConnect/AccessToken.php

@@ -26,7 +26,7 @@ public function __construct(array $token)
         parent::__construct($token);
 
         if (!isset($token['id_token'])) {
-            throw new InvalidAccessToken('id_token doesnot exists inside AccessToken');
+            throw new InvalidAccessToken('id_token does not exist inside AccessToken');
         }
     }
 

tests/Test/OpenIDConnect/AccessTokenTest.php

@@ -37,7 +37,7 @@ public function testConstructSuccess()
     public function testConstructFailedWithNoIdKey()
     {
         $this->expectException(InvalidAccessToken::class);
-        $this->expectExceptionMessage('id_token doesnot exists inside AccessToken');
+        $this->expectExceptionMessage('id_token does not exist inside AccessToken');
 
         $expectedToken = "XSFJSKLFJDLKFJDLSJFLDSJFDSLFSD";
         $expectedExpires = time();