doc: Correct usage sample styles

Ensure Crystal is used as usage examples blocks covered in README.

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This commit is contained in:
Luis Lavena 2016-01-24 20:01:05 -03:00
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commit 63bdc343f4

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@ -36,7 +36,7 @@ end
You can also extract values from placeholders (as named segments or globbing):
```
```crystal
tree.add "/products/:id", :product
result = tree.find "/products/1234"