Don't suggest now-deprecated APIs

Suggest getAvailableBlocksLong() instead of the now-deprecated
getAvailableBlocks() method.

Bug: 174799449
Test: m offline-sdk-docs
Change-Id: I34a36e00c3d1a16898b0a6f0a21e4cab9feb0d02

core/java/android/os/StatFs.java

@@ -109,7 +109,7 @@ public class StatFs {
      * The total number of blocks that are free on the file system, including
      * reserved blocks (that are not available to normal applications). This
      * corresponds to the Unix {@code statvfs.f_bfree} field. Most applications
-     * will want to use {@link #getAvailableBlocks()} instead.
+     * will want to use {@link #getAvailableBlocksLong()} instead.
      */
     public long getFreeBlocksLong() {
         return mStat.f_bfree;