chore: add changelog fragment 1727.docs.rst

newsfragments/1727.docs.rst

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+Docs: add guide "Testing your bot" (pytest examples)
+
+Add a new documentation page that shows how to test bot handlers with pytest
+without sending real requests to the Telegram API. The guide includes:
+- an echo handler example
+- a callback query example
+
+Both examples use dummy objects (Message / CallbackQuery) so developers can
+test logic in isolation.