Fix typo in comment: _PyHash_Double -> _Py_HashDouble.
diff --git a/Include/pyport.h b/Include/pyport.h
index 62aa53a..5309de6 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -132,7 +132,7 @@
 #endif
 
 /* Parameters used for the numeric hash implementation.  See notes for
-   _PyHash_Double in Objects/object.c.  Numeric hashes are based on
+   _Py_HashDouble in Objects/object.c.  Numeric hashes are based on
    reduction modulo the prime 2**_PyHASH_BITS - 1. */
 
 #if SIZEOF_VOID_P >= 8