chore: Update Tearsheet doc example (PR feedback)

Update packages/module/patternfly-docs/content/extensions/component-groups/examples/Tearsheet/TearsheetComparison.tsx

From: @mcoker

Co-authored-by: Michael Coker <35148959+mcoker@users.noreply.github.com>

Author: GAUNSD

packages/module/patternfly-docs/content/extensions/component-groups/examples/Tearsheet/TearsheetComparison.tsx

@@ -143,9 +143,7 @@ const sections = [
 
 const renderBodyContent = (sidebarClassName = '') => (
   <Flex direction={{ default: 'column' }} style={{ height: '100%', overflow: 'hidden' }}>
-    <PageSection hasShadowBottom style={{ flexShrink: 0, zIndex: 1 }}>
-      <SearchInput placeholder="Filter cards..." aria-label="Filter cards" />
-    </PageSection>
+    <SearchInput placeholder="Filter cards..." aria-label="Filter cards" />
     <div style={{ flex: 1, minHeight: 0, display: 'flex' }}>
       <Sidebar hasGutter className={sidebarClassName} style={{ height: '100%' }}>
         <SidebarPanel>