docs: update docker-compose documentation url in configuration.md

[AnzhiZhang]

Description

Change the docker-compose documentation url to the correct one. It should be Merge Compose files instead of extend.

See also

toolkit/bin/docker-compose

Lines 54 to 57 in 7f10105

	# Include docker-compose.override.yml if it is present
	if [[ -f "$TOOLKIT_ROOT/config/docker-compose.override.yml" ]]; then
	DOCKER_COMPOSE_FLAGS+=(-f "$TOOLKIT_ROOT/config/docker-compose.override.yml")
	fi

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