Update ``LSREAD`` docs

[germa89]

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• I have searched among the existing issues
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Description of the bug

From #1354:

@germa89, we need to add this command to our current non-interactive commands. If I don't close this out for the next patch release please assign yourself.

So.... I should have a look at wrapping LSREAD.

Steps To Reproduce

NA

Which Operating System are you using?

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Which Python version are you using?

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PyMAPDL Report

NA

Installed packages

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