Arrtribute Error when run snippet of delete and set storage lifecycle rule in snippets.py file

[HemangChothani]

Bucket class object called following method which raised an errors.

python-storage/docs/snippets.py

Line 194 in 5f27ffa

bucket.add_lifecycle_rule_delete(age=2)

python-storage/docs/snippets.py

Line 204 in 5f27ffa

bucket.add_lifecycle_rule_set_storage_class(

In bucket class the actual method names are:

python-storage/google/cloud/storage/bucket.py

Line 1938 in 5f27ffa

def add_lifecycle_delete_rule(self, **kw):

python-storage/google/cloud/storage/bucket.py

Line 1955 in 5f27ffa

def add_lifecycle_set_storage_class_rule(self, storage_class, **kw):

Clean Up:
Remove unused parameter from method definition from snippets.py file.