Clarify that tree shaking replay worker is optional (#12261)

Co-authored-by: Alex Krawiec <[email protected]>

Author: Luca Forstner

docs/platforms/javascript/common/session-replay/configuration.mdx

@@ -135,7 +135,7 @@ replayIntegration({
 });
 ```
 
-4. You can now <PlatformLink to="/configuration/tree-shaking/">Tree Shake</PlatformLink> the default included worker script. If you are using our bundler plugins (version 2.10.0 or later), you can do:
+4. (optional) To reduce bundle size, you can now <PlatformLink to="/configuration/tree-shaking/">Tree Shake</PlatformLink> the default included worker script. If you are using one of the [Sentry Bundler Plugins](https://github.com/getsentry/sentry-javascript-bundler-plugins) (version 2.10.0 or later):
 
 ```javascript
 sentryPlugin({
@@ -161,7 +161,7 @@ replayIntegration({
 
 ## Custom breadcrumbs
 
-Our SDKs allow you to send custom breadcrumbs, which will appear in the Replay Details UI alongside existing breadcrumbs. To learn how to send custom breadcrumbs, [read the docs here](/platforms/javascript/enriching-events/breadcrumbs/#customize-breadcrumbs). Note that any custom breadcrumbs you send will be reflected in both the Issue Details breadcrumbs UI and the Replay Details breadcrumbs tab.       
+Our SDKs allow you to send custom breadcrumbs, which will appear in the Replay Details UI alongside existing breadcrumbs. To learn how to send custom breadcrumbs, [read the docs here](/platforms/javascript/enriching-events/breadcrumbs/#customize-breadcrumbs). Note that any custom breadcrumbs you send will be reflected in both the Issue Details breadcrumbs UI and the Replay Details breadcrumbs tab.
 
 All custom breadcrumbs in the Replay Details will appear grey, and can be identified by the terminal logo.
 
@@ -173,4 +173,4 @@ If `message` is not set, then the breadcrumb will display the `data` property by
 
 ![Custom breadcrumb example with data](./img/data-custom-breadcrumb.png)
 
-The title of the breadcrumb will be the breadcrumb `category` that you set. If no `category` is set, then we will use the breadcrumb `message`. If that doesn't exist, we'll use the `description`. The last fallback with be a default title of "Custom".
+The title of the breadcrumb will be the breadcrumb `category` that you set. If no `category` is set, then we will use the breadcrumb `message`. If that doesn't exist, we'll use the `description`. The last fallback with be a default title of "Custom".