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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def build_docs():
 """ Trigger rebuild of all documentation that is dynamically generated from awslimitchecker. """

    if os.environ.get('CI', None) is not None:
        print("Not building dynamic docs in CI environment")
        raise SystemExit(0)
    region = os.environ.get('AWS_DEFAULT_REGION', None)
    if region is None:
        raise SystemExit("ERROR: Please export AWS_DEFAULT_REGION")
    logger.info("Beginning build of dynamically-generated docs")
    logger.info("Instantiating AwsLimitChecker")
    c = AwsLimitChecker(region=region)
    build_iam_policy(c)
    build_limits(c)
    build_runner_examples()