Fix code examples in SDK getting started

docs/sdks/python/GETTING_STARTED.md

@@ -30,6 +30,7 @@ result = users.create('[USER_ID]', 'email@example.com', 'password')
 ```python
 from appwrite.client import Client
 from appwrite.services.users import Users
+from appwrite.client import ID
 
 client = Client()
 
@@ -42,7 +43,7 @@ client = Client()
 
 users = Users(client)
 
-result = users.create('[USER_ID]', 'email@example.com', 'password')
+result = users.create(ID.unique(), 'email@example.com', 'password')
 ```
 
 ### Error Handling
@@ -51,7 +52,7 @@ The Appwrite Python SDK raises `AppwriteException` object with `message`, `code`
 ```python
 users = Users(client)
 try:
-  result = users.create('[USER_ID]', 'email@example.com', 'password')
+  result = users.create(ID.unique(), 'email@example.com', 'password')
 except AppwriteException as e:
   print(e.message)
 ```