docs: Fix incorrect Dock component example

[Khizarshah01]

this PR fixes the documentation example for the Dock component. The current example shows multiple icons wrapped inside a single DockIcon component, which creates a break layout where icons are stacked vertically within one dock item. this does not match the demo shown on the website

Changes Made:

• Updated the usage example in /apps/www/content/docs/components/dock.mdx
• Changed from single DockIcon containing all icons to multiple DockIcon components

Before:

<Dock>
  <DockIcon>
    <Home />
    <Settings />
    <Search />
  </DockIcon>
</Dock>

After:

<Dock>
  <DockIcon>
    <Home />
  </DockIcon>
  <DockIcon>
    <Settings />
  </DockIcon>
  <DockIcon>
    <Search />
  </DockIcon>
</Dock>

issue #870

[vercel]

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