Address review: remove warning about process-wide global state

Author: erlend-aasland

Doc/library/zoneinfo.rst

@@ -238,13 +238,6 @@ The following class methods are also available:
 
     .. TODO: Add "See `cache_behavior`_" reference when that section is ready.
 
-    .. warning::
-
-        Invoking this function may change the semantics of datetimes using
-        ``ZoneInfo`` in surprising ways; this modifies process-wide global state
-        and thus may have wide-ranging effects. Only use it if you know that you
-        need to.
-
 The class has one attribute:
 
 .. attribute:: ZoneInfo.key