fix: typos and suggestions

Co-authored-by: Andrew McFarland Campbell <117110183+AndrewMcFarlandCampbellGravitee@users.noreply.github.com>

Author: remisultan

pages/ae/am/am-installation.adoc

@@ -134,7 +134,6 @@ alerts:
 
 You can add as many `alerts.alert-engine.engines.<cluster-name>` as possible to connect to your Alert Engines.
 
-NOTE: You will only be able to connect to multiple clusters to send triggers but this not the case on the gateway to send
-events, the latter being handled by `alerts.alert-engine.engines.default`.
+NOTE: You can send triggers to multiple clusters, but on the gateway, events are only handled by `alerts.alert-engine.engines.default`.
 
-WARNING: `alerts.alert-engine.engines.default` is a mandatory cluster to add in both management-api and gateway configuration.
+WARNING: `alerts.alert-engine.engines.default` is required in both the management-api and gateway configurations.

pages/ae/apim/apim-installation.adoc

@@ -173,7 +173,6 @@ alerts:
 
 You can add as many `alerts.alert-engine.engines.<cluster-name>` as possible to connect to your Alert Engines.
 
-NOTE: You will only be able to connect to multiple clusters to send triggers but this not the case on the gateway to send
-events, the latter being handled by `alerts.alert-engine.engines.default`.
+NOTE: You can send triggers to multiple clusters, but on the gateway, events are only handled by `alerts.alert-engine.engines.default`.
 
-WARNING: `alerts.alert-engine.engines.default` is a mandatory cluster to add in both management-api and gateway configuration.
+WARNING: `alerts.alert-engine.engines.default` is required in both the management-api and gateway configurations.