docs(currency): Add missing line break

[bglick]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

docs update

What is the current behavior? (You can also link to an open issue here)

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change?

no

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

Insert missing line break between currency examples

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[bglick]

I signed it!

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