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doc: improve text around consistency of statistics values

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Original file line number	Diff line number	Diff line change
`@@ -924,10 +924,9 @@ vacuum insert threshold = vacuum base insert threshold + vacuum insert scale fac`
`924`	`924`	`<xref linkend="reloption-autovacuum-freeze-min-age"/> as this may allow`
`925`	`925`	`tuples to be frozen by earlier vacuums. The number of obsolete tuples and`
`926`	`926`	`the number of inserted tuples are obtained from the cumulative statistics system;`
`927`		`- it is a semi-accurate count updated by each <command>UPDATE</command>,`
`928`		`- <command>DELETE</command> and <command>INSERT</command> operation. (It is`
`929`		`- only semi-accurate because some information might be lost under heavy`
`930`		`- load.) If the <structfield>relfrozenxid</structfield> value of the table`
	`927`	`+ it is an eventually-consistent count updated by each <command>UPDATE</command>,`
	`928`	`+ <command>DELETE</command> and <command>INSERT</command> operation.`
	`929`	`+ If the <structfield>relfrozenxid</structfield> value of the table`
`931`	`930`	`is more than <varname>vacuum_freeze_table_age</varname> transactions old,`
`932`	`931`	`an aggressive vacuum is performed to freeze old tuples and advance`
`933`	`932`	`<structfield>relfrozenxid</structfield>; otherwise, only pages that have been modified`

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