add: Add change history

diff --git a/doc/build/changelog/unreleased_20/11317.rst b/doc/build/changelog/unreleased_20/11317.rst
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+.. change::
+    :tags: bug, orm
+    :tickets: 11317
+
+    Fixed a bug that caused a syntax error
+    when a function was specified to server_default when creating a column in MySQL.