Add apostrophes

[maximal]

No description provided.

[what-the-diff]

• Change "this package's" to "this package’s".
• Change "Ratchets Ratchet\WebSocket\MessageComponentInterface." to
  Ratchet’s Ratchet\WebSocket\MessageComponentInterface.
• Change the last sentence from: Once you've added the custom WebSocket route, be sure to restart our WebSocket server for the changes to take place. To: Once you’ve added the custom WebSocket route, be sure to restart our WebSocket server for the changes to take place.