docs(Swiper): fix typo in slidesPerView value (#2945)

Author: averyjohnston

docs/angular/slides.md

@@ -171,7 +171,7 @@ Swiper options should be provided as individual properties directly on the `<swi
 Let's say in an app with `ion-slides` we had the `slidesPerView` and `loop` options set:
 
 ```html
-<ion-slides [options]="{ slidesPerView: true, loop: true }">
+<ion-slides [options]="{ slidesPerView: 3, loop: true }">
   <ion-slide>Slide 1</ion-slide>
   <ion-slide>Slide 3</ion-slide>
   <ion-slide>Slide 3</ion-slide>

docs/vue/slides.md

@@ -309,7 +309,7 @@ Let's say in an app with `ion-slides` we had the `slidesPerView` and `loop` opti
 
 ```html
 <template>
-  <ion-slides :options="{ slidesPerView: true, loop: true }">
+  <ion-slides :options="{ slidesPerView: 3, loop: true }">
     <ion-slide>Slide 1</ion-slide>
     <ion-slide>Slide 2</ion-slide>
     <ion-slide>Slide 3</ion-slide>

versioned_docs/version-v6/angular/slides.md

@@ -169,7 +169,7 @@ Swiper options should be provided as individual properties directly on the `<swi
 Let's say in an app with `ion-slides` we had the `slidesPerView` and `loop` options set:
 
 ```html
-<ion-slides [options]="{ slidesPerView: true, loop: true }">
+<ion-slides [options]="{ slidesPerView: 3, loop: true }">
   <ion-slide>Slide 1</ion-slide>
   <ion-slide>Slide 3</ion-slide>
   <ion-slide>Slide 3</ion-slide>

versioned_docs/version-v6/vue/slides.md

@@ -307,7 +307,7 @@ Let's say in an app with `ion-slides` we had the `slidesPerView` and `loop` opti
 
 ```html
 <template>
-  <ion-slides :options="{ slidesPerView: true, loop: true }">
+  <ion-slides :options="{ slidesPerView: 3, loop: true }">
     <ion-slide>Slide 1</ion-slide>
     <ion-slide>Slide 3</ion-slide>
     <ion-slide>Slide 3</ion-slide>