fixed select data example for python and a typo

[sureshdsk]

What kind of change does this PR introduce?

docs update

What is the current behavior?

https://supabase.io/docs/guides/client-libraries#managing-data

• Typo in bulk insert - missing closing bracket for list
• Select python example is not working

What is the new behavior?

• Fixed typo for bulk insert
• fixed select example - replace from_ with table method

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