Update .env.example

Author: maticzav

examples/.env.example

@@ -1,5 +1,22 @@
+# ----------------------------------------------------------------------------
+# 
+# :GUIDE: 
+# 
+# Copy `.env.example` to `.env` to run all examples without any
+# additional setup. You can also manually export variables
+# and run each example separately.
+# 
+# ----------------------------------------------------------------------------
+
+# API ------------------------------------------------------------------------
+
 # Browser Use API Key
 BROWSER_USE_API_KEY=""
 
-# Webhook Verification Secret key
-SECRET_KEY=""
+# Webhooks -------------------------------------------------------------------
+
+# NOTE: Use something simple in development. In production, Browser Use Cloud
+#       will give you the production secret.
+SECRET_KEY="secret"
+
+# ----------------------------------------------------------------------------