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change key in Provider example (local) into LocalDefId

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

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Original file line number	Diff line number	Diff line change
@@ -168,7 +168,7 @@ Suppose you want to add a new query called `fubar`. You would:
`168`	`168`
`169`	`169`	`1. Implement the provider function:`
`170`	`170`	```rust,ignore
`171`		`- fn fubar<'tcx>(tcx: TyCtxt<'tcx>, key: DefId) -> Fubar<'tcx> { ... }`
	`171`	`+ fn fubar<'tcx>(tcx: TyCtxt<'tcx>, key: LocalDefId) -> Fubar<'tcx> { ... }`
`172`	`172`	```
`173`	`173`	2. Register it in the `provide` function:
`174`	`174`	```rust,ignore

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