Add comments explaining bitwarden token

LocalPackages/DataBrokerProtection/Sources/DataBrokerProtection/Authentication/DataBrokerProtectionSubscriptionManaging.swift

@@ -37,7 +37,8 @@ public final class DataBrokerProtectionSubscriptionManager: DataBrokerProtection
 
     public var accessToken: String? {
         // We use a staging token for privacy pro supplied through a github secret/action
-        // for PIR end to end tests
+        // for PIR end to end tests. This is also stored in bitwarden if you want to run
+        // the tests locally 
         if NSApplication.runType == .integrationTests, let token = ProcessInfo.processInfo.environment["PRIVACYPRO_STAGING_TOKEN"] {
             return token
         }