Update aws-proxy/AGENTS.md

Author: whummer

aws-proxy/AGENTS.md

@@ -32,7 +32,7 @@ TEST_PATH=tests/test_s3.py::test_my_logic make test
 ```
 
 When adding new integration tests, consider the following:
-* Include a mix of positive and negative assertions (e., presence and absence of resources).
+* Include a mix of positive and negative assertions (i.e., presence and absence of resources).
 * Include a mix of different configuration options, e.g., the `read_only: true` flag can be specified in the proxy service configuration YAML, enabling read-only mode (which should be covered by tests as well).
 * Include some tests that cover matching of resource names (the config YAML allows to specify ARN regex patterns), to ensure the proxy is able to selectively forward requests to certain matching AWS resources only.
 * Make sure to either use fixtures (preferred), or reliable cleanups for removing the resources; several fixtures for creating AWS resources are available in the `localstack.testing.pytest.fixtures` module