Merge "Telecom API doc cleanup."

 * app.

 * <p>

 * Further, the pre-loaded dialer will ALWAYS be used when the user places an emergency call.

 * <h2>Becoming the Default Phone App</h2>

 * The default dialer/phone app is one which provides the in-call user interface while the device is

 * in a call.  A device is bundled with a system provided default dialer/phone app.  The user may

 * choose a single app to take over this role from the system app.  An app which wishes to fulfill

 * one this role uses the {@code android.app.role.RoleManager} to request that they fill the role.

 * <p>

 * An app filling the role of the default phone app provides a user interface while the device is in

 * a call, and the device is not in car mode.

 * <p>

 * Below is an example manifest registration for an {@code InCallService}. The meta-data

 * {@link TelecomManager#METADATA_IN_CALL_SERVICE_UI} indicates that this particular