[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/point.h

Index: ppapi/cpp/point.h
diff --git a/ppapi/cpp/point.h b/ppapi/cpp/point.h
index 9daa6b53ddf3b7178c7f6bef67a34a9bc905059e..c881bbd55068898dba21d0774221978125e520f7 100644
--- a/ppapi/cpp/point.h
+++ b/ppapi/cpp/point.h
@@ -101,7 +101,7 @@ class Point {
   }
 
   /// Subtracts one Point from another Point by subtracting their x values
-  /// and y values. Returnes a new point with the result.
+  /// and y values. Returns a new point with the result.
   ///
   /// @param[in] other A Point.
   ///
@@ -240,7 +240,7 @@ class FloatPoint {
   }
 
   /// Subtracts one Point from another Point by subtracting their x values
-  /// and y values. Returnes a new point with the result.
+  /// and y values. Returns a new point with the result.
   ///
   /// @param[in] other A FloatPoint.
   ///