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: ritzow

Doc/library/os.rst

@@ -3880,7 +3880,7 @@ 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)