fix(sample): Comment git url in requirement.txt

Author: exaby73

samples/identity/functions/requirements.txt

@@ -1,8 +1,8 @@
 # Not published yet,
 # firebase-functions-python >= 0.0.1
 # so we use a relative path during development:
-# ./../../../
+./../../../
 # Or switch to git ref for deployment testing:
-git+https://github.com/firebase/firebase-functions-python.git@feat/before_email_sms_sent_blocking_fn#egg=firebase-functions
+# git+https://github.com/firebase/firebase-functions-python.git@main#egg=firebase-functions
 
 firebase-admin >= 6.0.1