Closes #276 crpr: describe handling of CR, PR in RECIST vignettes

[bundfussr]

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The following line requests to update the man pages by the "Man Pages" workflow.

/roxygenize

[github-actions]

Package	Line Rate	Health
admiralonco	97%	✔
Summary	97% (531 / 547)	✔

[bundfussr]

Hi @amitjaingsk , @starosto , @vinhn23 , do you have time to look at this small PR?

This update was requested by a user and I missed to include it in the last release. I would like to include it in the upcoming release.

[starosto]

@bundfussr generally I have no comments 👍 , however, I added two suggestions

[amitjaingsk]

@bundfussr reviewed very minor suggestion if it make sense