Doc: Fix broken manpage link (GH-21937)

sigprocmask is in section 2, not 3.
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Tim Burke 2020-09-15 16:26:06 -07:00 committed by GitHub
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@ -416,7 +416,7 @@ The :mod:`signal` module defines the following functions:
:data:`SIGKILL` and :data:`SIGSTOP` cannot be blocked.
.. availability:: Unix. See the man page :manpage:`sigprocmask(3)` and
.. availability:: Unix. See the man page :manpage:`sigprocmask(2)` and
:manpage:`pthread_sigmask(3)` for further information.
See also :func:`pause`, :func:`sigpending` and :func:`sigwait`.