feat(synthetics): Added deprecation notes

src/content/docs/synthetics/synthetic-monitoring/scripting-monitors/synthetic-scripted-browser-reference-monitor-versions-chrome-100.mdx

@@ -22,6 +22,10 @@ If you're using an older monitor version, see the [monitor version 0.5.0 and 0.6
 
 For more on monitor versions and runtime differences, see [Runtime environments](/docs/synthetics/new-relic-synthetics/scripting-monitors/scripted-monitor-runtime-environment).
 
+<Callout variant="important">
+  Selenium WebDriver promise manager / control flow allowed some functions to execute in order, without manually managing promises/async functions. This was removed in Selenium WebDriver 4.0 and is no longer available in the runtime. All async functions and promises need to be managed with `await` or with `.then` promise chains. This will ensure script functions execute in the expected order.
+</Callout>
+
 ## Top-level functions: Build your script [#structure]
 
 New Relic calls top-level functions directly from your `$webDriver` instance. These provide a wide range of functionality that covers many basic scriptable actions.

src/content/docs/synthetics/synthetic-monitoring/using-monitors/new-runtime.mdx

@@ -68,16 +68,16 @@ The new synthetic monitoring runtime includes out-of-the-box timing details when
 
 ## Deprecated features [#deprecated]
 
-We’re introducing new language that changes the [script syntax](/docs/synthetics/synthetic-monitoring/scripting-monitors/synthetic-scripted-browser-reference-monitor-versions-chrome-100) in your scripted browser monitors. The new runtime is backwards compatible with legacy runtime syntax. To avoid breaking monitors during the upgrade process, you may receive a deprecation warning in your script log output.
+The new runtime includes syntax changes and other deprecations. We’re introducing new language that changes the [script syntax](/docs/synthetics/synthetic-monitoring/scripting-monitors/synthetic-scripted-browser-reference-monitor-versions-chrome-100) in your scripted browser monitors. The new runtime is backwards compatible with legacy runtime syntax in most cases. To avoid breaking monitors during the upgrade process, you may receive a deprecation warning in your script log output.
 
 <table>
   <thead>
     <tr>
       <th style={{ width: "100px" }}>
-        Deprecated syntax
+        Deprecated 
       </th>
       <th>
-        New syntax
+        New (if applicable)
       </th>
       <th>
         Why?
@@ -119,5 +119,17 @@ We’re introducing new language that changes the [script syntax](/docs/syntheti
           New Relic is committed to inclusivity, which you can read more about on our [diversity, equity, and inclusion page](https://newrelic.com/about/diversity-equity-inclusion). 
         </td>
       </tr>
+
+      <tr>
+        <td>
+          Selenium WebDriver promise manager / control flow
+        </td> 
+        <td>
+          Use `async/await` or `.then` to handle promises
+        </td>
+        <td>
+          Selenium WebDriver promise manager / control flow allowed some functions to execute in order, without manually managing promises / async functions. This was removed in Selenium WebDriver 4.0 and is not available in the new runtime. All [async functions and promises](/docs/synthetics/synthetic-monitoring/scripting-monitors/synthetic-scripted-browser-reference-monitor-versions-chrome-100) need to be managed with `await` or with `.then` promise chains. This will ensure script functions execute in the expected order.
+        </td>
+      </tr>
     </tbody>
 </table>