Update runTestWithSnapshots documentation

package com.android.systemui.compose

import androidx.compose.runtime.snapshots.Snapshot

import com.android.systemui.kosmos.runCurrent

import kotlinx.coroutines.test.TestScope

import kotlinx.coroutines.test.UnconfinedTestDispatcher

import kotlinx.coroutines.test.runCurrent

import kotlinx.coroutines.test.runTest

/**

 * Runs the given test [block] in a [TestScope] that's set up such that the Compose snapshot state

 * is settled eagerly. This is the Compose equivalent to using an [UnconfinedTestDispatcher] or

 * using [runCurrent] a lot.

 * writes are properly applied to the global snapshot. This is for instance necessary if your test

 * is using `snapshotFlow {}` or any other mechanism that is observing the global snapshot.

 *

 * Note that this shouldn't be needed or used in a Compose test environment.

 * Note that this isn't needed in a Compose test environment, e.g. if you use the

 * `Compose(Content)TestRule`.

 */

fun TestScope.runTestWithSnapshots(block: suspend TestScope.() -> Unit) {

    val handle = Snapshot.registerGlobalWriteObserver { Snapshot.sendApplyNotifications() }