Step 1 - Go to Knowledge Base.
Step 2 - Click on the 
more actions menu > Select page history.
Step 3 - Select the current version and the previous version > Compare selected versions
Page Versions:
Only 2 versions can be compared at the same time.
It is not possible to view the individual changes made by each person in a single-page version.
Refer to the key to see the type of changes that were done by the contributor.
According to the Key:
The word
mustwas removed, and the word needs to was added by the contributor.