Correct fill color example in conditional formatting docs. (#2646)

Author: paul121

docs/topics/conditional-formatting.md

@@ -43,7 +43,7 @@ $conditional->setOperatorType(\PhpOffice\PhpSpreadsheet\Style\Conditional::OPERA
 $conditional->addCondition(80);
 $conditional->getStyle()->getFont()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_DARKGREEN);
 $conditional->getStyle()->getFill()->setFillType(\PhpOffice\PhpSpreadsheet\Style\Fill::FILL_SOLID);
-$conditional->getStyle()->getFill()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
+$conditional->getStyle()->getFill()->getStartColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
 
 $conditionalStyles = $spreadsheet->getActiveSheet()->getStyle('A1:A10')->getConditionalStyles();
 $conditionalStyles[] = $conditional;
@@ -63,7 +63,7 @@ $wizard = $wizardFactory->newRule(\PhpOffice\PhpSpreadsheet\Style\ConditionalFor
 $wizard->greaterThan(80);
 $wizard->getStyle()->getFont()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_DARKGREEN);
 $wizard->getStyle()->getFill()->setFillType(\PhpOffice\PhpSpreadsheet\Style\Fill::FILL_SOLID);
-$wizard->getStyle()->getFill()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
+$wizard->getStyle()->getFill()->getStartColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
 
 $conditional = $wizard->getConditional();
 ```
@@ -84,7 +84,7 @@ $conditional2->setOperatorType(\PhpOffice\PhpSpreadsheet\Style\Conditional::OPER
 $conditional2->addCondition(10);
 $conditional2->getStyle()->getFont()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_DARKRED);
 $conditional2->getStyle()->getFill()->setFillType(\PhpOffice\PhpSpreadsheet\Style\Fill::FILL_SOLID);
-$conditional2->getStyle()->getFill()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_RED);
+$conditional2->getStyle()->getFill()->getStartColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_RED);
 
 $conditionalStyles = $spreadsheet->getActiveSheet()->getStyle('A1:A10')->getConditionalStyles();
 $conditionalStyles[] = $conditional2;
@@ -98,7 +98,7 @@ $wizard = $wizardFactory->newRule(\PhpOffice\PhpSpreadsheet\Style\ConditionalFor
 $wizard->lessThan(10);
 $wizard->getStyle()->getFont()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_DARKGREEN);
 $wizard->getStyle()->getFill()->setFillType(\PhpOffice\PhpSpreadsheet\Style\Fill::FILL_SOLID);
-$wizard->getStyle()->getFill()->getColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
+$wizard->getStyle()->getFill()->getStartColor()->setARGB(\PhpOffice\PhpSpreadsheet\Style\Color::COLOR_GREEN);
 
 $conditional = $wizard->getConditional();
 ```