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docs: Add short "cover density" description

Also, previous commit1420f3a to fixts_rank_cd() for stripped lexemes was from a patch created by Alex Hill.

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Original file line number	Diff line number	Diff line change
`@@ -885,7 +885,9 @@ SELECT plainto_tsquery('english', 'The Fat & Rats:C');`
`885`	`885`	`ranking for the given document vector and query, as described in`
`886`	`886`	`Clarke, Cormack, and Tudhope's "Relevance Ranking for One to Three`
`887`	`887`	`Term Queries" in the journal "Information Processing and Management",`
`888`		`- 1999.`
	`888`	`+ 1999. Cover density is similar to <function>ts_rank</> ranking`
	`889`	`+ except that the proximity of matching lexemes to each other is`
	`890`	`+ taken into consideration.`
`889`	`891`	`</para>`
`890`	`892`
`891`	`893`	`<para>`

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