Fix phpstan, cs & phpdoc

Author: Thomas Lallement

src/PhpSpreadsheet/Spreadsheet.php

@@ -413,7 +413,7 @@ public function hasRibbonBinObjects(): bool
     }
 
     /**
-     * This workbook have in cell images
+     * This workbook has in cell images.
      */
     public function hasInCellDrawings(): bool
     {

src/PhpSpreadsheet/Writer/Xlsx/Metadata.php

@@ -10,8 +10,6 @@ class Metadata extends WriterPart
     /**
      * Write content types to XML format.
      *
-     * @param int $richDataCount
-     *
      * @return string XML Output
      */
     public function writeMetadata(int $richDataCount = 0): string

tests/PhpSpreadsheetTests/Writer/Xlsx/DrawingInCellTest.php

@@ -21,7 +21,6 @@ public function testPictureInCell(): void
         $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx');
 
         $spreadsheet->disconnectWorksheets();
-        self::assertNotNull($reloadedSpreadsheet->getSheet(0));
 
         $sheet = $reloadedSpreadsheet->getSheet(0);
         $drawings = $sheet->getInCellDrawingCollection();