updates system requirements for topologies (#3855)

Author: michellemacrh

downstream/snippets/cont-tested-system-config.adoc

@@ -34,6 +34,6 @@ a|
 
 | Database 
 | {PostgresVers}
-|
+| External (customer supported) databases require ICU support.
 
 |====

downstream/snippets/rpm-env-a-tested-system-config.adoc

@@ -2,14 +2,14 @@
 .Tested system configurations
 [options="header"]
 |====
-| Type | Description 
-| Subscription | Valid {PlatformName} subscription
+| Type | Description |
+| Subscription | Valid {PlatformName} subscription |
 | Operating system 
 a| 
 * {RHEL} 8.8 or later minor versions of {RHEL} 8. 
-* {RHEL} 9.2 or later minor versions of {RHEL} 9.
-| CPU architecture | x86_64, AArch64, s390x (IBM Z), ppc64le (IBM Power)
-| Ansible-core | Ansible-core version {CoreUseVers} or later
-| Browser | A currently supported version of Mozilla Firefox or Google Chrome
-| Database | {PostgresVers}
+* {RHEL} 9.2 or later minor versions of {RHEL} 9. |
+| CPU architecture | x86_64, AArch64, s390x (IBM Z), ppc64le (IBM Power) |
+| `ansible-core` | `ansible-core` version {CoreUseVers} or later | {PlatformNameShort} uses the system-wide ansible-core package to install the platform, but uses ansible-core 2.16 for both its control plane and built-in execution environments.
+| Browser | A currently supported version of Mozilla Firefox or Google Chrome |
+| Database | {PostgresVers} | External (customer supported) databases require ICU support.
 |====