docs(elasticloadbalancingv2): set proper default for stickiness

[msambol]

By default, stickiness is disabled. The duration is one day if stickiness is enabled,
but we don't surface that option to users. If stickinessCookieDuration is not
supplied, stickiness will not be enabled so the 1 day default doesn't make sense here.

Closes #29725.

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[nmussy]

LGTM, matches the behavior:

aws-cdk/packages/aws-cdk-lib/aws-elasticloadbalancingv2/lib/alb/application-target-group.ts

Lines 340 to 344 in e52510c

	if (props.stickinessCookieDuration) {
	this.enableCookieStickiness(props.stickinessCookieDuration, props.stickinessCookieName);
	} else {
	this.setAttribute('stickiness.enabled', 'false');
	}

[TheRealAmazonKendra]

I die on the inside a little every time I see this https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-elasticloadbalancingv2/lib/alb/application-target-group.ts#L73

   * Note: `stickinessCookieName` parameter depends on the presence of `stickinessCookieDuration` parameter.
   * If `stickinessCookieDuration` is not set, `stickinessCookieName` will be omitted.

But, that's not your change. Yours is good. Thanks for fixing that. I'm going to rename this a docs change for better clarity on what was updated.

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