Reword 'extremely common'.

Author: ZeroIntensity

peps/pep-0788.rst

@@ -268,8 +268,8 @@ and :c:func:`PyThreadState_Swap`, and :c:func:`PyGILState_Ensure`. The latter,
 ***********************************************************
 
 At the time of writing, the current behavior of :c:func:`PyGILState_Ensure` does not
-match the documentation. Instead of hanging the thread during finalization
-as previously noted, it's extremely common for it to crash with a segmentation
+always match the documentation. Instead of hanging the thread during finalization
+as previously noted, it's possible for it to crash with a segmentation
 fault. This is a `known issue <https://github.com/python/cpython/issues/124619>`_
 that could be fixed in CPython, but it's definitely worth noting
 here. Incidentally, acceptance and implementation of this PEP will likely fix