Apply suggestions from code review

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

Author: realFlowControl

docs/worker.md

@@ -180,9 +180,9 @@ $handler = static function () use ($workerServer) {
 // ...
 ```
 
-## Worker mode for extension developers
+## Worker Mode for Extension Developers
 
-### Request lifecycle
+### Request Lifecycle
 
 In worker mode FrankenPHP only goes through `RINIT` and `RSHUTDOWN` once per worker thread. In case you need to observe a worker request start and end, you can not rely on `RINIT` and `RSHUTDOWN` phases of the extension lifecycle. Instead, you are able to hook into the `sapi_module.activate` / `sapi_module.deactivate` function pointers to achieve the same effect (you can validate that the current SAPI is FrankenPHP by checking the value of `sapi_module.name`).