Remove @api annotation

src/Spout/Writer/Common/Entity/Sheet.php

@@ -41,7 +41,6 @@ class Sheet
     }
 
     /**
-     * @api
      * @return int Index of the sheet, based on order in the workbook (zero-based)
      */
     public function getIndex()
@@ -58,7 +57,6 @@ class Sheet
     }
 
     /**
-     * @api
      * @return string Name of the sheet
      */
     public function getName()
@@ -73,7 +71,6 @@ class Sheet
      *  - it should not contain these characters: \ / ? * : [ or ]
      *  - it should be unique
      *
-     * @api
      * @param string $name Name of the sheet
      * @throws \Box\Spout\Writer\Exception\InvalidSheetNameException If the sheet's name is invalid.
      * @return Sheet