Remove obsolete py3k comment.
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 615a2d3..c12db44 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -888,7 +888,6 @@
 static PyObject *
 init_filters(void)
 {
-    /* Don't silence DeprecationWarning if -3 was used. */
     PyObject *filters = PyList_New(5);
     unsigned int pos = 0;  /* Post-incremented in each use. */
     unsigned int x;