Fix docstring to be consistent with parameter name (prefix)
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index e5d1178..6f18da8 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -5130,7 +5130,7 @@
 PyDoc_STRVAR(posix_tempnam__doc__,
 "tempnam([dir[, prefix]]) -> string\n\n\
 Return a unique name for a temporary file.\n\
-The directory and a short may be specified as strings; they may be omitted\n\
+The directory and a prefix may be specified as strings; they may be omitted\n\
 or None if not needed.");
 
 static PyObject *