doc: clarify xgcd_vartime delegates to constant-time xgcd (pending #853) - #1333
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xgcd_vartimeforUint,NonZeroUintandOddUintcurrently callsxgcd(CT)due to #853. This is not documented, so callers expecting VT performance get CT
silently, and will silently change from CT to VT when #853 is implemented.
This adds an explicit NOTE explaining the current delegation and warning about
the future semantics change.
No code or logic change — documentation only.
No functional change in release build.