Update doc/reference submodule

nikic · nikic · commit 68a62b76d493 · 2021-03-21T20:54:42.000+01:00
In particular this pulls in an update to the auto-deref
recursion_limit example, to no longer rely on the Freeze query.
diff --git a/src/doc/reference b/src/doc/reference
@@ -1 +1 @@
-Subproject commit e32a2f928f8b78d534bca2b9e7736413314dc556
+Subproject commit d10a0af8dca25d9d548ca6a369fd66ad06acb3c9
