chore: fix oauth examples (#858)

Author: tiwarishubham635

examples/organization_api.py

@@ -16,12 +16,12 @@ def example():
     """
     Some example usage of using organization resources
     """
-    self.client = Client(
+    client = Client(
         account_sid=ACCOUNT_SID,
         credential_provider=OrgsCredentialProvider(CLIENT_ID, CLIENT_SECRET),
     )
 
-    accounts = self.client.preview_iam.organization(
+    accounts = client.preview_iam.organization(
         organization_sid=ORGS_SID
     ).accounts.stream()
     for record in accounts:

examples/public_oauth.py

@@ -17,12 +17,12 @@ def example():
     """
     Some example usage of message resources.
     """
-    self.client = Client(
+    client = Client(
         account_sid=ACCOUNT_SID,
         credential_provider=ClientCredentialProvider(CLIENT_ID, CLIENT_SECRET),
     )
 
-    msg = self.client.messages.create(
+    msg = client.messages.create(
         to=self.to_number, from_=self.from_number, body="hello world"
     )