Update cache behaviour in function docstring

[kumaranvpl]

Why are these changes needed?

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• I've added tests (if relevant) corresponding to the changes introduced in this PR.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Files with missing lines	Coverage Δ
autogen/oai/client.py	75.40% <100.00%> (+1.64%)	⬆️

... and 62 files with indirect coverage changes

[kumaranvpl]

#879 is fixed by this PR