docs: use dedicated classes for queue in mui-series examples

docs/src/animations.md

@@ -85,11 +85,11 @@ Begin your series with the `mui-series()` mixin. Inside this mixin, attach anima
 ```scss
 @include mui-series {
   // 2 second shake
-  .shake    { @include mui-queue(2s, 0s, shake); }
+  .my-queue-shake     { @include mui-queue(2s, 0s, shake); }
   // 1 second spin with a 2 second pause
-  .spin     { @include mui-queue(1s, 2s, spin); }
+  .my-queue-spin      { @include mui-queue(1s, 2s, spin); }
   // 1 second zoom and fade
-  .fade-zoom { @include mui-queue(1s, 0s, fade, zoom); }
+  .my-queue-fade-zoom { @include mui-queue(1s, 0s, fade, zoom); }
 }
 ```
 
@@ -98,9 +98,9 @@ To add a delay to the start of the queue, add the length in seconds to the `mui-
 ```scss
 // 2 second delay before the first shake
 @include mui-series(2s) {
-  .shake  { @include mui-queue(2s, 0s, shake()); }
-  .spin   { @include mui-queue(1s, 2s, spin()); }
-  .wiggle { @include mui-queue(wiggle); }
+  .my-queue-shake     { @include mui-queue(2s, 0s, shake()); }
+  .my-queue-spin      { @include mui-queue(1s, 2s, spin()); }
+  .my-queue-wiggle    { @include mui-queue(wiggle); }
 }
 ```