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doc: PG 12 relnotes, add mention of single-child optimization

Add mention of single-child optimization for partitions and UNION ALL.Reported-by: David RowleyDiscussion:https://postgr.es/m/CAKJS1f8R8riwBXw==7ijV=UZNuhP+3qXgDBKSiM+=_cTf4mXXw@mail.gmail.com

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`@@ -842,6 +842,18 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>`
`842`	`842`	`<listitem>`
`843`	`843`	`<!--`
`844`	`844`	`Author: Tom Lane <tgl@sss.pgh.pa.us>`
	`845`	`+2019-03-25 [8edd0e794] Suppress Append and MergeAppend plan nodes that have a s`
	`846`	`+-->`
	`847`	`+`
	`848`	`+ <para>`
	`849`	`+ Improve optimization of partition and <literal>UNION ALL</literal>`
	`850`	`+ queries that have only a single child (David Rowley)`
	`851`	`+ </para>`
	`852`	`+ </listitem>`
	`853`	`+`
	`854`	`+ <listitem>`
	`855`	`+<!--`
	`856`	`+Author: Tom Lane <tgl@sss.pgh.pa.us>`
`845`	`857`	`2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan`
`846`	`858`	`-->`
`847`	`859`

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