Update READMEs

applications/90-ibm-sync-resources/README.md

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+IBM MAS Sync Resources
+===============================================================================
+Instantiated by the /gitops/root-applications/ibm-mas-instance-root/templates/90-ibm-sync-resources.yaml root application.
+
+Various resources required to run Jobs contained in the 91-ibm-sync-jobs chart.
+This application has a lower syncwave (90) than that of the 91-ibm-sync-jobs application responsible for running the jobs.
+This is to ensure that the resources to persist long enough for the PostDelete hooks in that 91-ibm-sync-jobs to complete,
+while still being cleaned up successfully when MAS instance is deprovisioned.
+

applications/91-ibm-sync-jobs/README.md

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+IBM MAS Sync Resources
+===============================================================================
+Instantiated by the /gitops/root-applications/ibm-mas-instance-root/templates/91-ibm-sync-jobs.yaml root application.
+
+Defines Jobs to perform various tasks that need to happen before ibm-sls and the suite are installed, and after they are removed.
+
+Supporting resources are defined in the 90-ibm-sync-resources chart which is managed by an application with a lower syncwave (90).
+This is to ensure that these resources perist long enough for any PostDelete hooks in this chart to complete.