Update setNextPostDialWaitChar API

This CL does the following:
  - make the API public
  - rename it from setNextPostDialWaitChar to setNextPostDialChar
  - remove reference to "wait" from the API documentation

BUG: 19216940, 19216942
Change-Id: Ic4c7f44a900fd79875318d8c565c3aacaa42b962
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index a180f44..b89ce0e 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -1001,14 +1001,11 @@
     /**
      * Informs listeners that this {@code Connection} has processed a character in the post-dial
      * started state. This is done when (a) the {@code Connection} is issuing a DTMF sequence;
-     * (b) it has encountered a "wait" character; and (c) it wishes to signal Telecom to play
-     * the corresponding DTMF tone locally.
+     * and (b) it wishes to signal Telecom to play the corresponding DTMF tone locally.
      *
      * @param nextChar The DTMF character that was just processed by the {@code Connection}.
-     *
-     * @hide
      */
-    public final void setNextPostDialWaitChar(char nextChar) {
+    public final void setNextPostDialChar(char nextChar) {
         checkImmutable();
         for (Listener l : mListeners) {
             l.onPostDialChar(this, nextChar);