[doc beta]Removes the @submodule reference to ember-glimmer #16196
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Partial fix for ember-learn/ember-api-docs#419
Removes the "ember-glimmer" reference from the api docs:
![image](https://user-images.githubusercontent.com/3609063/34752084-395bffcc-f57e-11e7-8955-6e35412a264b.png)