Convert uses of @hide to block tag

In most places the `@hide` doctag is treated as a block tag on its own
line. However, there are a few places where it is treated as an inline
doctag, e,g. `{@hide}`, and some places where it looks like a block
tag but is inline in the text, e.g. `Some text. @hide`. Dealing with
all the types increases the complexity of Metalava and makes it
slightly slower.

This change replaces the non-block tag forms with a block tag.

Flag: EXEMPT change the form of @hide does not change the API or behavior
Bug: 429965593
Test: m checkapi
Change-Id: I4ffe44a329dbcb7f0a7bd61af16c3bd99cacdac4

remoteauth/framework/java/android/remoteauth/IDeviceDiscoveryListener.aidl

@@ -21,7 +21,7 @@ import android.remoteauth.RemoteDevice;
 /**
  * Binder callback for DeviceDiscoveryCallback.
  *
- * {@hide}
+ * @hide
  */
 oneway interface IDeviceDiscoveryListener {
         /** Reports a {@link RemoteDevice} being discovered. */