Remove comments from 2.10.4 release notes.
Remove comments from 2.10.4 release notes.

They can break some parser in the documentation generation pipeline
resulting in a broken website.

vl4ds/scala-lang,boldradius/scala-lang,vl4ds/scala-lang,andy1138/scala-lang,boldradius/scala-lang,jeantil/scala-lang,boldradius/scala-lang,jeantil/scala-lang,jeantil/scala-lang,boldradius/scala-lang,andy1138/scala-lang,andy1138/scala-lang,andy1138/scala-lang,vl4ds/scala-lang,vl4ds/scala-lang,jeantil/scala-lang