docs: Add deque to libobs/util table of content

docs/sphinx/reference-libobs-util.rst

@@ -9,6 +9,7 @@ Platform/Utility API Reference (libobs/util)
    reference-libobs-util-circlebuf
    reference-libobs-util-config-file
    reference-libobs-util-darray
+   reference-libobs-util-deque
    reference-libobs-util-dstr
    reference-libobs-util-platform
    reference-libobs-util-profiler