Fix some markdown mistakes in sce documentation

[Oliboy50]

Attempt to fix some markdown mistakes in sce documentation.
https://docs.angularjs.org/api/ng/provider/$sceDelegateProvider

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[Oliboy50]

I signed it!

[Narretz]

Hi, the CLA didn't go through. :( Have you signed the CLA with the same email address with which you have committed the change?