[3.13] gh-144233: Fix typo in os.eventfd documentation (GH-144234) (#144237)

gh-144233: Fix typo in os.eventfd documentation (GH-144234)
(cherry picked from commit 9982147)

Co-authored-by: Solomon Ritzow <11698787+ritzow@users.noreply.github.com>

Author: miss-islington

Doc/library/os.rst

@@ -3807,7 +3807,7 @@ features:
        import os
 
        # semaphore with start value '1'
-       fd = os.eventfd(1, os.EFD_SEMAPHORE | os.EFC_CLOEXEC)
+       fd = os.eventfd(1, os.EFD_SEMAPHORE | os.EFD_CLOEXEC)
        try:
            # acquire semaphore
            v = os.eventfd_read(fd)