Update docs/product/explore/session-replay/mobile/performance-overhead.mdx

Co-authored-by: Jasmin <[email protected]>

Author: romtsn

docs/product/explore/session-replay/mobile/performance-overhead.mdx

@@ -33,7 +33,7 @@ There are different stages in the lifecycle of a mobile application, each with d
 
 ### App Start
 
-There is virtually no overhead from the SDK during application startup. It performs only a few lightweight tasks, such as registering the necessary listeners for system events and scheduling a background thread for capturing.
+There is virtually no overhead from the SDK during application start up. It performs only a few lightweight tasks, such as registering the necessary listeners for system events and scheduling a background thread for capturing.
 
 ### Main Thread