message: tidy demo code samples
diff: @@ -13,13 +13,15 @@ const examples = [
  element: (
  <Box p={4}>
  <LiveEditor
  - code={`<MergeBox
  + code={`
  +<MergeBox
  state='pending'
  numCommits={21}
  repoUrl='https://github.com/primer/primer-react'
  branchName='master'
  onMerge={() => alert('merge!')}
  -/>`}
  +/>
  + `.trim()}
  scope={{MergeBox}}
  />
  </Box>
  @@ -30,11 +32,13 @@ const examples = [
  element: (
  <Box p={4}>
  <LiveEditor
  - code={`<MergeButton
  + code={`
  +<MergeButton
  primary
  numCommits={2}
  onClick={() => alert('merge!')}
  -/>`}
  +/>
  + `.trim()}
  scope={{MergeButton}}
  />
  </Box>
  