system-variables: remove the default value descriptions for last_xxx variables #19982
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First-time contributors' checklist
What is changed, added or deleted? (Required)
This PR removes the default value descriptions for the following last_xxx variables:
last_plan_from_binding
last_plan_from_cache
last_sql_use_alloc
Reason: their values are determined by whether a function is used or not, so the default values are meaningless and confusing.
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