fix(browser): make H2 an H3

src/content/docs/browser/browser-monitoring/browser-pro-features/session-replay.mdx

@@ -53,7 +53,7 @@ We take data privacy seriously, so we built session replay with:
 * **Minimal data storage**: Session replay does not store screenshots or videos. It only records the essential DOM state changes required to recreate the user's experience. This results in a much smaller amount of data being stored.
 * **Robust default privacy settings**: Session replay includes default privacy settings designed to limit the potential sharing of sensitive customer information. These settings can be further customized to meet specific privacy requirements.
 
-## App performance [#performance-impact]
+### App performance [#performance-impact]
 
 Session replay minimizes impact on your app's performance with: