can you say "fix the news" in this situation?
For example, when a false news is out to public and they later fix it and saying that it's wrong and give the new truth. Do we say fix the news? Is there a phrase for this? E.g. Many newspapers fixed the news for the previous publish. Thank you.

Question

Answer

"fix the news" doesn't sounds very natural to me.

Correct  sounds like a much appropriate choice. Correct is used when something that is WRONG is changed to become RIGHT.

-  All newspapers should verify their sources and correct their mistakes.

Fix is used more when an object (bike, car,  etc) is in a bad state (ie, broken, not working, bad condition) and it is improved.

- I need to fix my bike (the bike is broken)

News cannot be broken or not working. It's simply not telling the truth.

I hope this helps you!