[docs] [issue37779] configparser: add documentation about several read() behaviour

[Joannah Nanjekye]

Joannah Nanjekye <nanjekyejoannah at gmail.com> added the comment:

I think you can build on the story in the quick start section.

You can build on from the last section that starts with the paragraph:

Now that we have created and saved a configuration file, let’s read it back and explore the data it holds.

As it has some examples on read().

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<https://bugs.python.org/issue37779>
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