[Snackbar] Made snackbar javadoc more clear of how its dismissing works.

PiperOrigin-RevId: 468494275
(cherry picked from commit 581f734)

lib/java/com/google/android/material/snackbar/Snackbar.java

@@ -52,13 +52,13 @@
  * bottom of the screen on mobile and lower left on larger devices. Snackbars appear above all other
  * elements on screen and only one can be displayed at a time.
  *
- * <p>They automatically disappear after a timeout or after user interaction elsewhere on the
- * screen, particularly after interactions that summon a new surface or activity. Snackbars can be
- * swiped off screen.
- *
  * <p>Snackbars can contain an action which is set via {@link #setAction(CharSequence,
  * android.view.View.OnClickListener)}.
  *
+ * <p>Snackbars automatically disappear after a timeout. They can also be dismissed by being swiped
+ * off screen, by action click, from a new snackbar being displayed, or manually via a call to
+ * {@link #dismiss()}.
+ *
  * <p>To be notified when a snackbar has been shown or dismissed, you can provide a {@link Callback}
  * via {@link BaseTransientBottomBar#addCallback(BaseCallback)}.
  */