PEP 703: Fix Sphinx warnings (#4907)

Author: Secrus

peps/pep-0703.rst

@@ -1812,6 +1812,7 @@ trade-offs remain an open issue.
 
 References
 ==========
+* :pep:`683` -- Immortal Objects, Using a Fixed Refcount.
 
 .. [#yuemmwang2019] "Exploiting Parallelism Opportunities with Deep Learning Frameworks."
    Yu Emma Wang, Carole-Jean Wu, Xiaodong Wang, Kim Hazelwood, David Brooks. 2019.
@@ -1825,8 +1826,6 @@ References
    Jiho Choi, Thomas Shull, and Josep Torrellas. PACT 2018.
    https://dl.acm.org/doi/abs/10.1145/3243176.3243195.
 
-.. [#pep683] :pep:`683` -- Immortal Objects, Using a Fixed Refcount.
-
 .. [#tid] https://github.com/colesbury/nogil/blob/f7e45d6bfbbd48c8d5cf851c116b73b85add9fc6/Include/object.h#L428-L455.
 
 .. [#rcu] "What is RCU, Fundamentally?"
@@ -1871,8 +1870,6 @@ References
    counting. Recent versions of Go use a non-generational garbage
    collector. https://go.dev/blog/ismmkeynote.
 
-.. [#nogil] https://github.com/colesbury/nogil.
-
 .. [#nogil312] https://github.com/colesbury/nogil-3.12.
 
 .. [#howto] Python HOWTOs.