Fixes a bug with getting comment ids

[AustinKnutsonSprint]

The current code returns "0" for every comment id, corrupting the comments in the Word document. This change fixes the code to match the intended behavior of obtaining an unused comment id.

[o365devx]

Docs Build status updates of commit 0ffca81:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 218: [Error] Invalid syntax in W:\2nrd-s\docs\docfx.json. Please validate your syntax with a JSON validator like http://jsonlint.com/ and update the JSON file in the repo with correct syntax.

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