docs: remove fire and forget language from wear docs

  <dt><b>Messages</b></dt>

  <dd>The <a href="{@docRoot}reference/com/google/android/gms/wearable/MessageApi.html"><code>MessageApi</code></a> class

  can send messages designed for "fire-and-forget" commands, such as controlling a handheld's

  can send messages and is good for remote procedure calls (RPC), such as controlling a handheld's

  media player from the wearable or starting an intent on the wearable from the handheld.

  The system always delivers the message when the handheld and wearable are connected and delivers

  an error when the devices are disconnected. Messages are great for one-way requests or for a

</ul>

<p>

Unlike data items, there is no syncing between the handheld and wearable apps.

Messages are a one-way communication mechanism that's meant for

"fire-and-forget" tasks, such as sending a message to the wearable

Messages are a one-way communication mechanism that's good for remote procedure calls (RPC),

such as sending a message to the wearable

to start an activity. You can also use messages in request/response model

where one side of the connection sends a message, does some work,

sends back a response message.</p>