fix: loopAddBlankSlides incorrect documentation

[rodrigovallades]

The SwiperOptions type definitions, which I believe is used to auto-generate the api website (https://swiperjs.com/swiper-api#param-loopAddBlankSlides), has incorrect information.

The API documentation states that loopAddBlankSlides defaults to false, but it actually defaults to true. This drove me crazy for some time (my implementation was broken), until I decided to take a look at the source code.

src/core/defaults.mjs - line 103

swiper/src/core/defaults.mjs

Lines 101 to 105 in 76355b8

	// loop
	loop: false,
	loopAddBlankSlides: true,
	loopAdditionalSlides: 0,
	loopPreventsSliding: true,

[nolimits4web]

Merged, thanks!