Update .env.example

.env.example

@@ -1,8 +1,24 @@
-# Copy this to `.env` and `.env.test` files
+# Copy this to `.env.local` and `.env.test` files
 
-BITDRIFT_API_KEY=
-SENTRY_AUTH_TOKEN=
+# The env the app is running in e.g. development, testflight, production
+EXPO_PUBLIC_ENV=development
+
+# The log level for the app.
 EXPO_PUBLIC_LOG_LEVEL=debug
+# Currently unused. Enable debug for a subset of the debug logs.
 EXPO_PUBLIC_LOG_DEBUG=
+
+# This is the commit hash that the current bundle was made from. The user can
+# see the commit hash in the app's settings along with the other version info.
+# Useful for debugging/reporting.
 EXPO_PUBLIC_BUNDLE_IDENTIFIER=
+# This will always be in the format of YYMMDD, so that it always increases for
+# each build. This should only be used for Statsig reporting and shouldn't be
+# used to identify a specific bundle.
 EXPO_PUBLIC_BUNDLE_DATE=0
+
+# Bitdrift
+BITDRIFT_API_KEY=
+
+# Sentry (deprecated)
+SENTRY_AUTH_TOKEN=