Adds changes from Ian's last comment (#44)

Author: sarahsimpers

source/landing-zone.txt

@@ -135,16 +135,17 @@ requirements when you create a landing zone:
 
        To get recommendations and learn more about this topic, see
        :ref:`arch-center-backups`.
-   * - Alert Requirements
-     - Identify required alert events, thresholds, recipients, and
+
+   * - Observability Requirements
+     - Identify requirements for external system integrations that you
+       use for observability, such as
+       ingestion of {+service+} log files, activity
+       feed data, audit logs, alerts, and metrics. Identify required alert events, thresholds, recipients, and
        alert delivery mechanism(s).
 
        To get recommendations and learn more about this topic, see
        :ref:`arch-center-monitoring-alerts`.
-   * - Integration Requirements
-     - Identify requirements for external system integrations, such as
-       ingestion of {+service+} log files, activity
-       feed data, audit logs, alerts, and metrics.
+
    * - Security
      - Identify and define any specific security
        requirements, including requirements for encryption, network security, authentication, and authorization. Consider integration requirements with Security