chore(cloudwatch): correct spelling error in alarm-base docstrings (#26781)

This PR fixes a spelling error in alarm-base docstrings for `addAlarmAction`, `addInsufficientDataAction`, and `addOkAction` where `SnsAction` was spelled `SnsAcion`.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: 7empestx

packages/aws-cdk-lib/aws-cloudwatch/lib/alarm-base.ts

@@ -57,7 +57,7 @@ export abstract class AlarmBase extends Resource implements IAlarm {
   /**
    * Trigger this action if the alarm fires
    *
-   * Typically SnsAcion or AutoScalingAction.
+   * Typically SnsAction or AutoScalingAction.
    */
   public addAlarmAction(...actions: IAlarmAction[]) {
     if (this.alarmActionArns === undefined) {
@@ -70,7 +70,7 @@ export abstract class AlarmBase extends Resource implements IAlarm {
   /**
    * Trigger this action if there is insufficient data to evaluate the alarm
    *
-   * Typically SnsAcion or AutoScalingAction.
+   * Typically SnsAction or AutoScalingAction.
    */
   public addInsufficientDataAction(...actions: IAlarmAction[]) {
     if (this.insufficientDataActionArns === undefined) {
@@ -83,7 +83,7 @@ export abstract class AlarmBase extends Resource implements IAlarm {
   /**
    * Trigger this action if the alarm returns from breaching state into ok state
    *
-   * Typically SnsAcion or AutoScalingAction.
+   * Typically SnsAction or AutoScalingAction.
    */
   public addOkAction(...actions: IAlarmAction[]) {
     if (this.okActionArns === undefined) {