Minor typos in expression syntax in 2 templates

### Affected Templates

+ [media-service-output-primary-key](https://github.com/Azure/azure-quickstart-templates/tree/master/media-service-output-primary-key)
+ [orchard-cms-video-portal](https://github.com/Azure/azure-quickstart-templates/tree/master/orchard-cms-video-portal)

### Issue Details

It looks like there was a typo introduced into the ARM expression syntax in a couple of places in the above templates in this commit:

+ [remove providers().apiVersion[] calls](https://github.com/Azure/azure-quickstart-templates/commit/14b217398cea9cdb1c7d1ce4f46e8dc05d6208ec)

This commit replaced ```providers('xxx', 'yyy').apiVersions[0]``` with a hard-coded api version string (e.g. ```'2016-01-01'```) in a lot of templates, but the two at the top of this issue had a bit of a typo applied to them (which looks maybe like a bad search-and-replace) and the result is an invalid expression as follows.

Instead of this:

```providers('xxx', 'yyy').apiVersions[0]``` becomes ```'2015-10-01'```

we've got this:

```providers('xxx', 'yyy').apiVersions[0]``` becomes ```providers('xxx', 'yyy')'2015-10-01'0]```

Here's a link to the places where this typo appears:

**media-service-output-primary-key**
+https://github.com/Azure/azure-quickstart-templates/commit/14b217398cea9cdb1c7d1ce4f46e8dc05d6208ec#diff-b90477dfb8304da4555ed5eecc9c54a0

**orchard-cms-video-portal**
+https://github.com/Azure/azure-quickstart-templates/commit/14b217398cea9cdb1c7d1ce4f46e8dc05d6208ec#diff-1593b4fb5902f184ad01c8e10b1654f0

I'll send a PR with the fixes as soon as I can.

Incidentally, I found these while trying to write an ARM-linter to validate expression syntax here: https://github.com/KingslandConsulting/Kingsland.ArmLinter. If I get it fully working it might be useful to run as part of the CI process to validate templates in the azure-quickstart-templates repo?

Start with the media-service-output-primary-key and orchard-cms-video-portal template directories, then inspect the two locations identified in commit 14b2173. Correct the malformed ARM expressions to use the intended hard-coded API version and validate that both templates contain valid expression syntax.

Written by the indexing model from the issue text.