Add doc strings for classes.

Author: njb90

src/Api/ApiResponse.php

@@ -14,7 +14,7 @@
 use Cloudinary\ArrayUtils;
 
 /**
- * Class ApiResponse
+ * Defines the response returned by the API.
  *
  * @api
  */

src/Configuration/AccountConfig.php

@@ -11,7 +11,8 @@
 namespace Cloudinary\Configuration;
 
 /**
- * Class AccountConfig
+ * Defines the account configuration required to connect your application to Cloudinary.
+ * **Learn more**: <a href="https://cloudinary.com/documentation/how_to_integrate_cloudinary#get_familiar_with_the_cloudinary_console" target="_blank">Get account details from the Cloudinary Console.</a>
  *
  * @api
  */

src/Configuration/ApiConfig.php

@@ -11,7 +11,7 @@
 namespace Cloudinary\Configuration;
 
 /**
- * Class ApiConfig
+ * Defines the global configuration when making requests to the Cloudinary API.
  *
  * @property string    $uploadPrefix    Used for changing default API host.
  * @property int|float $timeout         Describing the timeout of the request in seconds.

src/Configuration/AuthTokenConfig.php

@@ -11,7 +11,8 @@
 namespace Cloudinary\Configuration;
 
 /**
- * Class AuthTokenConfig
+ * Defines the configuration for delivering token-based authenticated media assets.
+ * **Learn more**: <a href=https://cloudinary.com/documentation/control_access_to_media#delivering_token_based_authenticated_media_assets target="_blank">Delivering token based authenticated media assets</a>
  *
  * @api
  */

src/Configuration/Configuration.php

@@ -16,7 +16,7 @@
 use Psr\Http\Message\UriInterface;
 
 /**
- * Class Configuration
+ * Defines the available global configurations.
  *
  * @api
  */

src/Configuration/LoggingConfig.php

@@ -3,7 +3,7 @@
 namespace Cloudinary\Configuration;
 
 /**
- * Class LoggingConfig
+ * Defines the global configuration for logging messages when using the SDK.
  *
  * @property array  $file     Settings for logging messages to a file.
  * @property array  $errorLog Settings for logging messages to PHP error_log() handler.

src/Configuration/ResponsiveBreakpointsConfig.php

@@ -13,7 +13,8 @@
 use Cloudinary\Cache\Adapter\CacheAdapter;
 
 /**
- * Class ResponsiveBreakpointsConfig
+ * Defines the global responsive breakpoints configuration.
+ * **Learn more**: <a href="https://cloudinary.com/documentation/image_upload_api_reference#responsive_breakpoints_parameter_request_settings" target="_blank">Responsive breakpoints</a>
  *
  * @api
  */

src/Configuration/TagConfig.php

@@ -13,7 +13,7 @@
 use Cloudinary\Tag\BaseTag;
 
 /**
- * Class TagConfig
+ * Defines the global configuration for html tags generated using the Cloudinary PHP SDK.
  *
  * @property string $videoPosterFormat Image format of the video poster.
  * @property string $quotesType        Sets the type of the quotes to use (single or double). Default:

src/Configuration/UrlConfig.php

@@ -11,7 +11,7 @@
 namespace Cloudinary\Configuration;
 
 /**
- * Class UrlConfig
+ * Defines the global configuration applied when generating Cloudinary URLs.
  *
  * @property bool $secure  Force HTTPS URLs for resources even if they are embedded in non-secure HTTP pages.
  * @property bool $forceVersion By default set to self::DEFAULT_FORCE_VERSION.