[book][cache][tip] added cache annotations.
minor #3959 [book][cache][tip] added cache annotations. (aitboudad)

This PR was merged into the 2.3 branch.

Discussion
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[book][cache][tip] added cache annotations.

| Q             | A
| ------------- | ---
| Doc fix?	 | no
| New docs? | yes
| Applies to | all
|Fixed tickets |	-

Commits
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a81d330 [book][cache][tip] added cache annotations.