[Sync EN] singleton.xml: update EN-Revision hash after removing extra "an" before "enumerations" (#2729)

* Initial plan

* Update EN-Revision hash in singleton.xml to sync with EN commit 828980b

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Co-authored-by: lacatoire <20201470+lacatoire@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lacatoire <20201470+lacatoire@users.noreply.github.com>

Author: Copilot

language/types/singleton.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- EN-Revision: f908fff129bcd8ec1605658e06457cb04e5b2b51 Maintainer: Fan2Shrek Status: ready -->
+<!-- EN-Revision: 828980b619bb4300e196924598b6a5d398f630e4 Maintainer: Fan2Shrek Status: ready -->
 <!-- Reviewed: yes -->
 <sect1 xml:id="language.types.singleton">
  <title>Type singleton</title>