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Remove duplicates from Find usages result (dotnet#2396)

* filter out symbol uses which have the same range, but different occurrence kinds* add a comment

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Original file line number	Diff line number	Diff line change
`@@ -123,7 +123,9 @@ type internal FSharpFindUsagesService`
`123`	`123`	`\|> Async.Parallel`
`124`	`124`	`\|> liftAsync`
`125`	`125`
`126`		`-return symbolUses\|> Array.concat`
	`126`	+// FCS may return several `FSharpSymbolUse`s for same range, which have different `ItemOccurrence`s (Use, UseInAttribute, UseInType, etc.)
	`127`	`+// We don't care about the occurrence type here, so we distinct by range.`
	`128`	`+return symbolUses\|> Array.concat\|> Array.distinctBy(fun x-> x.RangeAlternate)`
`127`	`129`	`}`
`128`	`130`
`129`	`131`	`for symbolUsein symbolUsesdo`

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