Update MediaMuxer javadoc to reflect that B-frame muxing is supported since Android Nougat MR1.

Change-Id: I56df4258dd83d0d23013bb282e6e24ed93776dd7
diff --git a/media/java/android/media/MediaMuxer.java b/media/java/android/media/MediaMuxer.java
index ad4feec..3214cde 100644
--- a/media/java/android/media/MediaMuxer.java
+++ b/media/java/android/media/MediaMuxer.java
@@ -34,7 +34,7 @@
 
 /**
  * MediaMuxer facilitates muxing elementary streams. Currently MediaMuxer supports MP4, Webm
- * and 3GP file as the output. It also supports muxing B-frames in MP4 since Android Nougat.
+ * and 3GP file as the output. It also supports muxing B-frames in MP4 since Android Nougat MR1.
  * <p>
  * It is generally used like this:
  *
@@ -191,14 +191,14 @@
     <td>&#9675;</td>
     <td>&#9679;</td>
    </tr>
-    <td align="center">Muxing B-Frames(bi-directional predicted frames)</td>
+    <td align="center">Muxing B-Frames (bi-directional predicted frames)</td>
     <td>&#9675;</td>
     <td>&#9675;</td>
     <td>&#9675;</td>
     <td>&#9675;</td>
     <td>&#9675;</td>
     <td>&#9675;</td>
-    <td>&#8277;</td>
+    <td>&#9675;</td>
     <td>&#8277;</td>
     <td>&#8277;</td>
    </tr>