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add a comment in generate_system_id()

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Original file line number	Diff line number	Diff line change
`@@ -82,6 +82,7 @@ def generate_system_id():`
`82`	`82`	`secs=int((date2-date1).total_seconds())`
`83`	`83`	`usecs=date2.microsecond`
`84`	`84`
	`85`	`+# see pg_resetwal.c : GuessControlValues()`
`85`	`86`	`system_id=0`
`86`	`87`	`system_id\|= (secs<<32)`
`87`	`88`	`system_id\|= (usecs<<12)`

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