docs(lambda): Update nodejs18.x doc (#25037)

Node18 is available in `me-central-1`, `eu-central-2` and `eu-south-2`.

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Author: andclt

packages/aws-cdk-lib/aws-lambda/lib/runtime.ts

@@ -87,7 +87,7 @@ export class Runtime {
   public static readonly NODEJS_16_X = new Runtime('nodejs16.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });
 
   /**
-   * The NodeJS 18.x runtime (nodejs18.x) supported in all commercial regions except me-central-1, eu-central-2 and eu-south-2.
+   * The NodeJS 18.x runtime (nodejs18.x)
    */
   public static readonly NODEJS_18_X = new Runtime('nodejs18.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });