docs: update ROLLING

ROLLING.md

@@ -3,13 +3,18 @@
 ## Pre-requisites
 
 * install .NET SDK 5 with installer: https://dotnet.microsoft.com/download/dotnet/5.0
+* install necessary build tools:
+  ```bash
+  ./build.sh --init
+  # restart terminal after that
+  ```
 
 ## Rolling
 
 1. Checkout the upstream main/release branch of the `playwright` repository.
 1. Checkout the main/release branch of the `playwright-dotnet` repository.
-1. Pick the latest driver from GitHub Action where you want to roll to. For releases, it should be `v1.X.Y`. For main branch, it should be something like `v1.X.Y-<timestamp>`.
-1. By default it will pick the `playwright` project from `../playwright`. You can override it by setting the `PW_SRC_DIR` environment variable.
+3. Pick the latest driver from GitHub Action where you want to roll to. For releases, it should be `1.X.Y`. For main branch, it should be something like `1.X.Y-<timestamp>`.
+4. By default it will pick the `playwright` project from `../playwright`. You can override it by setting the `PW_SRC_DIR` environment variable.
 
 ```bash
 ./build.sh --roll <driver-version>