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doc: Fix name of CRC algorithm in "Reliability" section.

This section claims we use CRC-32 for WAL records and two-phasestate files, but we've actually used CRC-32C since v9.5 (commit5028f22). Fix that.Reviewed-by: Robert HaasDiscussion:https://postgr.es/m/ZrUFpLP-w2zTAHqq%40nathanBackpatch-through: 12

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doc/src/sgml
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`‎doc/src/sgml/wal.sgml‎`

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Original file line number	Diff line number	Diff line change
`@@ -186,7 +186,7 @@`
`186`	`186`	`<itemizedlist>`
`187`	`187`	`<listitem>`
`188`	`188`	`<para>`
`189`		`- Each individual record in a WAL file is protected by a CRC-32 (32-bit) check`
	`189`	`+ Each individual record in a WAL file is protected by a CRC-32C (32-bit) check`
`190`	`190`	`that allows us to tell if record contents are correct. The CRC value`
`191`	`191`	`is set when we write each WAL record and checked during crash recovery,`
`192`	`192`	`archive recovery and replication.`
`@@ -212,7 +212,7 @@`
`212`	`212`	`</listitem>`
`213`	`213`	`<listitem>`
`214`	`214`	`<para>`
`215`		`- Individual state files in <filename>pg_twophase</filename> are protected by CRC-32.`
	`215`	`+ Individual state files in <filename>pg_twophase</filename> are protected by CRC-32C.`
`216`	`216`	`</para>`
`217`	`217`	`</listitem>`
`218`	`218`	`<listitem>`

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`‎doc/src/sgml/wal.sgml‎`

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