fix: 2023 -> 2023 in document shepherd template (#3923)

ietf/templates/doc/shepherd_writeup.txt

@@ -1,6 +1,6 @@
 {# Keep in sync with https://github.com/ietf-chairs/chairs.ietf.org/blob/main/documents/qa-style-writeup-template.md #}{% if doc.stream %}{% if doc.stream.slug == 'ietf' %}# Document Shepherd Writeup
 
-*This version is dated 8 April 2023.*
+*This version is dated 8 April 2022.*
 
 Thank you for your service as a document shepherd. Among the responsibilities is
 answering the questions in this writeup to give helpful context to Last Call and
@@ -130,4 +130,4 @@ to answer all of them.
 [11]: https://www.rfc-editor.org/info/bcp97
 [12]: https://www.rfc-editor.org/rfc/rfc8126.html
 {% else %}There is no default shepherd writeup template for the {{doc.stream}} stream.
-{% endif %}{% else %}There is no stream set for this document (thus, no default shepherd writeup template).{% endif %}
+{% endif %}{% else %}There is no stream set for this document (thus, no default shepherd writeup template).{% endif %}