Improved phpdoc of Credis_Client (#165)

Author: midlan

Client.php

@@ -59,7 +59,7 @@ public function __construct($message, $code = 0, $exception = NULL)
  * @method int|Credis_Client           dbsize()
  *
  * Keys:
- * @method int|Credis_Client           del(string $key)
+ * @method int|Credis_Client           del(string|array $key)
  * @method int|Credis_Client           exists(string $key)
  * @method int|Credis_Client           expire(string $key, int $seconds)
  * @method int|Credis_Client           expireAt(string $key, int $timestamp)
@@ -75,13 +75,13 @@ public function __construct($message, $code = 0, $exception = NULL)
  * @method int|Credis_Client           append(string $key, string $value)
  * @method int|Credis_Client           decr(string $key)
  * @method int|Credis_Client           decrBy(string $key, int $decrement)
- * @method bool|string|Credis_Client   get(string $key)
+ * @method false|string|Credis_Client  get(string $key)
  * @method int|Credis_Client           getBit(string $key, int $offset)
  * @method string|Credis_Client        getRange(string $key, int $start, int $end)
  * @method string|Credis_Client        getSet(string $key, string $value)
  * @method int|Credis_Client           incr(string $key)
  * @method int|Credis_Client           incrBy(string $key, int $decrement)
- * @method array|Credis_Client         mGet(array $keys)
+ * @method false|array|Credis_Client   mGet(array $keys)
  * @method bool|Credis_Client          mSet(array $keysValues)
  * @method int|Credis_Client           mSetNx(array $keysValues)
  * @method bool|Credis_Client          set(string $key, string $value, int | array $options = null)