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Doc: in v12 release notes, explain how to replace uses of consrc and adsrc.

While you can find that info if you drill down far enough, it seems morehelpful to put something right in the compatibility notes. Per a questionfrom Ivan Sergio Borgonovo.Discussion:https://postgr.es/m/a6359855-2a5e-a56c-ebba-4ea46a1f0ebe@webthatworks.it

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doc/src/sgml
- release-12.sgml

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`‎doc/src/sgml/release-12.sgml`

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Original file line number	Diff line number	Diff line change
`@@ -1590,6 +1590,16 @@ Author: Peter Eisentraut <peter_e@gmx.net>`
`1590`	`1590`	`linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>consrc</structfield>`
`1591`	`1591`	`column (Peter Eisentraut)`
`1592`	`1592`	`</para>`
	`1593`	`+`
	`1594`	`+ <para>`
	`1595`	`+ This column has been deprecated for a long time, because it did not`
	`1596`	`+ update in response to other catalog changes (such as column renamings).`
	`1597`	`+ The recommended way to get a text version of a check constraint's`
	`1598`	`+ expression from <structname>pg_constraint</structname>`
	`1599`	`+ is <literal>pg_get_expr(conbin, conrelid)</literal>.`
	`1600`	`+ <function>pg_get_constraintdef()</function> is also a useful`
	`1601`	`+ alternative.`
	`1602`	`+ </para>`
`1593`	`1603`	`</listitem>`
`1594`	`1604`
`1595`	`1605`	`<listitem>`
`@@ -1603,6 +1613,14 @@ Author: Peter Eisentraut <peter_e@gmx.net>`
`1603`	`1613`	`linkend="catalog-pg-attrdef"><structname>pg_attrdef</structname></link>.<structfield>adsrc</structfield>`
`1604`	`1614`	`column (Peter Eisentraut)`
`1605`	`1615`	`</para>`
	`1616`	`+`
	`1617`	`+ <para>`
	`1618`	`+ This column has been deprecated for a long time, because it did not`
	`1619`	`+ update in response to other catalog changes (such as column renamings).`
	`1620`	`+ The recommended way to get a text version of a default-value expression`
	`1621`	`+ from <structname>pg_attrdef</structname> is <literal>pg_get_expr(adbin,`
	`1622`	`+ adrelid)</literal>.`
	`1623`	`+ </para>`
`1606`	`1624`	`</listitem>`
`1607`	`1625`
`1608`	`1626`	`<listitem>`

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