added DR update API

src/doctors/dto/update-doctors-request.dto.ts

@@ -91,7 +91,7 @@ export class UpdateDoctorsRequestDto {
   })
   emailId?: string;
 
-  // @IsOptional()
+  @IsOptional()
   @IsString({ message: 'Pan number must be a string' })
   @ApiProperty({
     example: 'HSLDY8769P',