Unify "file-descriptor" to "file descriptor".
diff --git a/Doc/c-api/abstract.rst b/Doc/c-api/abstract.rst
index 9a53987..5ea8ace 100644
--- a/Doc/c-api/abstract.rst
+++ b/Doc/c-api/abstract.rst
@@ -351,7 +351,7 @@
.. cfunction:: int PyObject_AsFileDescriptor(PyObject *o)
- Derives a file-descriptor from a Python object. If the object is an integer or
+ Derives a file descriptor from a Python object. If the object is an integer or
long integer, its value is returned. If not, the object's :meth:`fileno` method
is called if it exists; the method must return an integer or long integer, which
is returned as the file descriptor value. Returns ``-1`` on failure.