Fix stale/inaccurate comments in UpdateVersion test cases

[Copilot]

Test comments described a "double increment" carry behavior that doesn't exist in UpdateVersion. The actual loop increments at position i, resets to 0 and moves to i-1 on overflow, then breaks on the next non-overflowing increment — no position ever gets incremented twice.

Changes

• UpdateVersion_MaxLastPart_RollsOverCascades: Replaced misleading "incremented TWICE" explanation with accurate per-iteration trace
• UpdateVersion_MaxThirdPart_RollsOverCascades: Corrected claim that i=1 increments from 1→2; it increments from 0→1 and breaks
• UpdateVersion_MultipleRollovers_HandlesCorrectly: Removed "loop continues and third gets incremented again" narrative; replaced with accurate step-by-step trace and dropped the incorrect inline Assert comment

Before → After (example)

// Before (inaccurate):
// Loop at i=3: 65535 >= MaxValue, so set to 0 and increment position 2 to 1
// Loop at i=2: position 2 is 1 (not at max), so increment again to 2 and break
// Result: position gets incremented TWICE (once in rollover, once in loop)

// After (accurate):
// i=3: versionIdx[3]++ -> 65536 >= MaxValue, reset to 0, move to i=2
// i=2: versionIdx[2]++ -> 1, below max, break

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