Update corrections.py to return sorted dataFrame by read()

[ahiguera-mx]

What is the problem / what does the code in this PR do
Need to return sorted dataFrame by index when using function read()
Can you briefly describe how it works?
here is an example of using read() and why is important to return sorted data to avoid confusions
https://github.com/ahiguera-mx/xenon/blob/master/plot_gains.ipynb
Can you give a minimal working example (or illustrate with a figure)?
here is an example of using read() and why is important to return sorted data to avoid confusions
https://github.com/ahiguera-mx/xenon/blob/master/plot_gains.ipynb
Please include the following if applicable:

• Update the docstring(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Please make sure that all automated tests have passed before asking for a review (you can save the PR as a draft otherwise).

[JoranAngevaare]

Looks good, thanks also for the test!