DOC avoid hyphenation in identifier

Author: jnothman

doc/faq.rst

@@ -261,7 +261,7 @@ consider the lack of fork-safety in Accelerate / vecLib as a bug.
 In Python 3.4+ it is now possible to configure ``multiprocessing`` to
 use the 'forkserver' or 'spawn' start methods (instead of the default
 'fork') to manage the process pools. To work around this issue when
-using scikit-learn, you can set the JOBLIB_START_METHOD environment
+using scikit-learn, you can set the ``JOBLIB_START_METHOD`` environment
 variable to 'forkserver'. However the user should be aware that using
 the 'forkserver' method prevents joblib.Parallel to call function
 interactively defined in a shell session.