Include key points related to caching in BBEs

[ShammiL]

Description

In the BBE page related to caching adding key points related to caching can make it easier for the user to spot these key points rather than rigorously going through the documentations.
For instance, we can mention that Ballerina caching is thread-safe in the BBE page.

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Area/BBEs

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[anupama-pathirage]

@daneshk What is the status of this? Can we prioritize this ? Can we add this to update 9 related content and get it completed by update 9?

[daneshk]

@NipunaRanasinghe, Can you check and update it?

[NipunaRanasinghe]

@NipunaRanasinghe, Can you check and update it?

@daneshk Ack. will include this in the documentation roadmap.