Update Doc/c-api/long.rst

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: ZeroIntensity

Doc/c-api/long.rst

@@ -586,7 +586,7 @@ distinguished from a number.  Use :c:func:`PyErr_Occurred` to disambiguate.
 
 .. c:macro:: PyLong_AsPid(pid)
 
-   Macro for converting a Python integer into a process ID.
+   Macro for converting a Python integer into a process identifier.
 
    This can be defined as an alias to :c:func:`PyLong_AsLong`,
    :c:func:`PyLong_FromLongLong`, or :c:func:`PyLong_AsInt`, depending on the