docs: Update descriptions and structure for Toggle/Group

[ronkeiser]

Currently, the descriptions for Toggle and Toggle Group are reversed!

---

Also, the structure for Toggle includes Toggle.Thumb and Toggle.Input components which do not exist:

<script lang="ts">
  import { Toggle } from "bits-ui";
</script>

<Toggle.Root>
  <Toggle.Thumb />
  <Toggle.Input />
</Toggle.Root>

---

This PR switches the descriptions and removes the extraneous components from the structure:

<script lang="ts">
  import { Toggle } from "bits-ui";
</script>

<Toggle.Root/>

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