Fix a typo in the doc-comment of the Bar structure: 'inststance ->
instance'.
Add also 'is' to the comment inside Bar's `new()` function (suggested
by Dirk):
// `pdev` is valid by the invariants of `Device`.
Fixes:
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|---|---|---|
| .. | ||
| id.rs | ||
| io.rs | ||
| irq.rs | ||