Update .github/instructions/expected-files.instructions.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: redsun82

.github/instructions/expected-files.instructions.md

@@ -1,4 +1,4 @@
 ---
 applyTo: "**/*.expected"
 ---
-Ignore these files. These are generated to be correct by running the tests, and should not be edited by an agent.
+Ignore these files. These are generated to be correct by running the tests, and should not be edited manually.