Mistakes in your documentation make it harder for users to test your app or to solve a problem. For users any out of date content is a mistake, they do not care why.
Quick win: update the text
Focus on the text being up to date. You can’t always delay a release until all images, GIFs and videos are updated. They can take time as they often involve multiple people. Documentation text can often be changed by one person.
Use a bulk find and replace app to update the documentation text the day the new version is released.
Use case: Submit button changed to Save
The new version of App X by your company changes all the ‘Submit’ buttons to ‘Save’. This change was made based on user testing. This key action is expected to initially cause some confusion.
The documentation manager uses Find and Replace by Easy Apps to search for the word ‘Submit’. There are hundreds of pages in the documentation. She uses the option to limit searches to the parent and child pages for App X.

Before finalizing changes the documentation manager can remove pages from being changed.

Confluence documentation tools to bulk find and replace
Find and Replace by Easy Apps (our app)
It is also one of the features of Space Content Manager, a suite of tools in one app we have on the Atlassian Marketplace.
Here is another app with bulk find and replace Easy Find & Replace, Copy Pages & Spaces, Add & Remove Label.