Fixed spelling errors

docs/docs/release_notes.xml

@@ -32,7 +32,7 @@ Non-Backwards Compatible Changes:
      in addition to just raw ranking accuracy. This changes their return types
      from double to matrix<double,1,2>.
    - Generalized segment_image() so it works on any pixel type or array of
-     vectors.  I also changed it's interface slightly.  In particular, I removed
+     vectors.  I also changed its interface slightly.  In particular, I removed
      the min_diff parameter and replaced it with an explicit min_size parameter.
    - Changed how the SURF descriptor is computed slightly to improve its
      accuracy.  The interface to the user has not been changed, however, the
@@ -927,7 +927,7 @@ Bug fixes:
   - Fixed a bug in scale_columns.  It said it didn't have any destructive aliasing 
     when in fact it destructively aliased its second argument.
   - Fixed a bug in the random number generator where setting the seed back to ""
-    didn't result in the object going back to it's initial state.
+    didn't result in the object going back to its initial state.
 
 Other:
   - Reorganized the matrix expression code.  It's now much simpler and the