docs(currency): add missing line break

Insert missing line break between currency examples

PR  (angular#15083)

Author: bglick

src/ng/filter/filters.js

@@ -31,7 +31,7 @@ var ZERO_CHAR = '0';
        <div ng-controller="ExampleController">
          <input type="number" ng-model="amount" aria-label="amount"> <br>
          default currency symbol ($): <span id="currency-default">{{amount | currency}}</span><br>
-         custom currency identifier (USD$): <span id="currency-custom">{{amount | currency:"USD$"}}</span>
+         custom currency identifier (USD$): <span id="currency-custom">{{amount | currency:"USD$"}}</span><br>
          no fractions (0): <span id="currency-no-fractions">{{amount | currency:"USD$":0}}</span>
        </div>
      </file>