Add a missing changelog entry for error message changes to v2.10.0.

## Changelog

This is the only change; please take a look.

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5713
GitOrigin-RevId: fbc527ebc8dc78e98841c9b67e90f9e7f2102abb

.prettierignore

@@ -1,2 +1,3 @@
 /.hlint.yaml
+/CHANGELOG.md
 /server/tests-py/**/*

CHANGELOG.md

@@ -244,8 +244,29 @@ The way it works is:
 
 Please submit any feedback you may have for this feature at https://github.com/hasura/graphql-engine/issues/2768.
 
-### Bug fixes and improvements
+### Error message syntax
 
+We are slowly standardizing the format of error messages, especially with regards to the way values are quoted.
+
+Any errors generated during the parsing of GraphQL or the construction of the schema might have changed the way they quote certain values. For example, GraphQL names are now always quoted with single quotes, leading to changes such as the following.
+
+_Before:_
+
+```
+field "nonexistent_root_field" not found in type: 'query_root'
+```
+
+_After:_
+
+```
+field 'nonexistent_root_field' not found in type: 'query_root'
+```
+
+If you are depending on the specific text of an error message and/or parsing the message, you may need to update your code accordingly.
+
+Further changes are forthcoming along similar lines.
+
+### Bug fixes and improvements
 
 - server: Kriti `basicFunctions` now available for REST Connectors and Webhook Transforms
 - server: Fix bug where Hasura SQL trigger was not dropped when MS SQL Server source is dropped