Fix a bunch of spelling mistakes :\

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index 23709bbbd7d44d8fd2dcd0d264539b8c51e3486d..ec0614b5e04c16e34ebefe3d725887da5e84d842 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -94,7 +94,7 @@ class Handle {
 // Handle operations.
 // They might invoke garbage collection. The result is an handle to
 // an object of expected type, or the handle is an error if running out
-// of space or encounting an internal error.
+// of space or encountering an internal error.
 
 void NormalizeProperties(Handle<JSObject> object,
                          PropertyNormalizationMode mode);