Commit98afb83

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contrib/bloom documentation improvement

This commit documents rounding of "length" parameter and absence of supportfor unique indexes and NULLs searching. Backpatch to 9.6 where contrib/bloomwas introduced.Discussion:https://postgr.es/m/CAF4Au4wPQQ7EHVSnzcLjsbY3oLSzVk6UemZLD1Sbmwysy3R61g%40mail.gmail.comAuthor: Oleg Bartunov with minor editorialization by meBackpatch-through: 9.6

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Original file line number	Diff line number	Diff line change
`@@ -51,8 +51,8 @@`
`51`	`51`	`<term><literal>length</literal></term>`
`52`	`52`	`<listitem>`
`53`	`53`	`<para>`
`54`		`- Length of each signature (index entry) in bits. The default`
`55`		`- is <literal>80</literal> bits and maximum is <literal>4096</literal>.`
	`54`	`+ Length of each signature (index entry) in bits, it is rounded up to the nearest`
	`55`	`+multiple of 16. The defaultis <literal>80</literal> bits and maximum is <literal>4096</literal>.`
`56`	`56`	`</para>`
`57`	`57`	`</listitem>`
`58`	`58`	`</varlistentry>`
`@@ -242,6 +242,20 @@ DEFAULT FOR TYPE text USING bloom AS`
`242`	`242`	`operations in the future.`
`243`	`243`	`</para>`
`244`	`244`	`</listitem>`
	`245`	`+`
	`246`	`+ <listitem>`
	`247`	`+ <para>`
	`248`	`+ <literal>bloom</literal> access method doesn't support`
	`249`	`+ <literal>UNIQUE</literal> indexes.`
	`250`	`+ </para>`
	`251`	`+ </listitem>`
	`252`	`+`
	`253`	`+ <listitem>`
	`254`	`+ <para>`
	`255`	`+ <literal>bloom</literal> access method doesn't support searching for`
	`256`	`+ <literal>NULL</literal> values.`
	`257`	`+ </para>`
	`258`	`+ </listitem>`
`245`	`259`	`</itemizedlist>`
`246`	`260`	`</para>`
`247`	`261`	`</sect2>`

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