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doc: Mention the rename of wal_keep_segments GUC in release note.

Commitf5dff45 renamed wal_keep_segments to wal_keep_size.This commit adds the mention to this change in the release note.Author: Fujii MasaoReviewed-by: David SteeleDiscussion:https://postgr.es/m/dc4768f2-1eff-d2fc-35ba-6b2985b7cb6c@oss.nttdata.com

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`@@ -209,6 +209,28 @@ Author: Fujii Masao <fujii@postgresql.org>`
`209`	`209`
`210`	`210`	`<listitem>`
`211`	`211`	`<!--`
	`212`	`+Author: Fujii Masao <fujii@postgresql.org>`
	`213`	`+2020-07-20 [f5dff45962] Rename wal_keep_segments to wal_keep_size.`
	`214`	`+-->`
	`215`	`+`
	`216`	`+ <para>`
	`217`	`+ Rename configuration parameter <varname>wal_keep_segments</varname>`
	`218`	`+ to <xref linkend="guc-wal-keep-size"/> (Fujii Masao)`
	`219`	`+ </para>`
	`220`	`+`
	`221`	`+ <para>`
	`222`	`+ This determines how much WAL to retain for the standby server,`
	`223`	`+ specified in megabytes rather than number of files. If you`
	`224`	`+ previously used <varname>wal_keep_segments</varname>,`
	`225`	`+ the following formula will give you an approximately equivalent setting:`
	`226`	`+<programlisting>`
	`227`	`+wal_keep_size = wal_keep_segments * wal_segment_size (typically 16MB)`
	`228`	`+</programlisting>`
	`229`	`+ </para>`
	`230`	`+ </listitem>`
	`231`	`+`
	`232`	`+ <listitem>`
	`233`	`+<!--`
`212`	`234`	`Author: Tom Lane <tgl@sss.pgh.pa.us>`
`213`	`235`	`2020-03-05 [84eca14bc] Remove ancient hacks to ignore certain opclass names in`
`214`	`236`	`-->`

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