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Pipeline mode disallows multicommand strings

... so mention that in appropriate places of the libpq docs.Backpatch to 14.Reported-by: RekGRpth <rekgrpth@gmail.com>Discussion:https://postgr.es/m/17235-53bb38fc5be593dc@postgresql.org

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Original file line number	Diff line number	Diff line change
`@@ -4594,6 +4594,11 @@ int PQsendQuery(PGconn conn, const char command);`
`4594`	`4594`	`(on the same connection) until <xref linkend="libpq-PQgetResult"/>`
`4595`	`4595`	`has returned a null pointer, indicating that the command is done.`
`4596`	`4596`	`</para>`
	`4597`	`+`
	`4598`	`+ <para>`
	`4599`	`+ In pipeline mode, command strings containing more than one SQL command`
	`4600`	`+ are disallowed.`
	`4601`	`+ </para>`
`4597`	`4602`	`</listitem>`
`4598`	`4603`	`</varlistentry>`
`4599`	`4604`
`@@ -5046,7 +5051,8 @@ int PQflush(PGconn *conn);`
`5046`	`5051`	`<xref linkend="libpq-PQpipelineStatus"/> can be used`
`5047`	`5052`	`to test whether pipeline mode is active.`
`5048`	`5053`	`In pipeline mode, only <link linkend="libpq-async">asynchronous operations</link>`
`5049`		`- are permitted, and <literal>COPY</literal> is disallowed.`
	`5054`	`+ are permitted, command strings containing multiple SQL commands are`
	`5055`	`+ disallowed, and so is <literal>COPY</literal>.`
`5050`	`5056`	`Using synchronous command execution functions`
`5051`	`5057`	`such as <function>PQfn</function>,`
`5052`	`5058`	`<function>PQexec</function>,`

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