update(changelog): fixed code highlight section

CHANGELOG.md

@@ -38,9 +38,8 @@ v0.6.0-rc1 releases the following changes:
 * **tabs:** add accessibility links between tabs and content ([5d3bab56](https://github.com/angular/material/commit/5d3bab566ec71ff9f4a65faad7ef2674cd04c1b9))
 * **bottomSheet:** focus the first available button on open ([768cc098](https://github.com/angular/material/commit/768cc098fdc4b09e1c5f3faab526a7ed9e324702), closes [#571](https://github.com/angular/material/issues/571))
 * **interimElement:** allow options.parent to be a selector ([342051e0](https://github.com/angular/material/commit/342051e0af2ca5cd42555b30a47249006d6228b7), closes [#640](https://github.com/angular/material/issues/640))
-* **mdDialog:** enhance show API with *confirm()* and *alert()* builder functions. ([12b8cbc06](https://github.com/angular/material/commit/12b8cbc06065669df6b22b9bdbb6764398ff26fb)
-> See [Demos](https://material.angularjs.org/#/demo/material.components.dialog) JavaScript source
->```js
+* **mdDialog:** enhance show API with *confirm()* and *alert()* builder functions. ([12b8cbc06](https://github.com/angular/material/commit/12b8cbc06065669df6b22b9bdbb6764398ff26fb). <br/>See [Demos](https://material.angularjs.org/#/demo/material.components.dialog) JavaScript source
+```js
 $mdDialog.show(
       $mdDialog.alert()
         .title('This is an alert title')