concurrency: fix STM example to add to balance
Worked by coincidence; the txn would always retry and there was a 1/10 chance it would pass by selecting the same to/from keys.release-3.3
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1d195521c7
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b206afc4a7
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@ -58,7 +58,7 @@ func ExampleSTM_apply() {
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// transfer amount
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xfer := fromInt / 2
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fromInt, toInt = fromInt-xfer, toInt-xfer
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fromInt, toInt = fromInt-xfer, toInt+xfer
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// writeback
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stm.Put(fromK, fmt.Sprintf("%d", fromInt))
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