Issue #14456: Remove contradiction about blocking signals from bad merge

Doc/library/signal.rst

@@ -22,9 +22,6 @@ explicitly reset (Python emulates the BSD style interface regardless of the
 underlying implementation), with the exception of the handler for
 :const:`SIGCHLD`, which follows the underlying implementation.
 
-There is no way to "block" signals temporarily from critical sections (since
-this is not supported by all Unix flavors).
-
 
 Execution of Python signal handlers
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^