Fix Sphinx.

Author: ZeroIntensity

peps/pep-0797.rst

@@ -289,7 +289,7 @@ Interpreter Lifetimes
 When an interpreter is destroyed, proxies wrapping objects from that
 interpreter may still exist elsewhere. To prevent this from causing crashes,
 an interpreter will invalidate all proxies pointing its objects by overwriting
-their wrapped object with :const:`None`.
+their wrapped object with ``None``.
 
 To demonstrate, the following snippet first prints out ``Alive``, and then
 ``None`` after deleting the interpreter:
@@ -347,7 +347,7 @@ Directly Sharing Proxy Objects
 ------------------------------
 
 The initial revision of this proposal took an approach where an instance of
-:class:`~conccurent.interpreters.SharedObjectProxy` was :term:`immortal`. This
+:class:`~concurrent.interpreters.SharedObjectProxy` was :term:`immortal`. This
 allowed proxy objects to be directly shared across interpreters, because their
 reference count was thread-safe (since it never changed due to immortality).