Noticed while looking through the android sdk of a tag like this:
<eat-comment/>
What is it used for? A reference example for it is here:
https://github.com/android/platform_frameworks_base/blob/master/core/res/AndroidManifest.xml
<eat-comment/> is used to suppress comment lines from the documentation output.
You can read a little bit about it, with examples, here: https://android.googlesource.com/platform/frameworks/base/+/2888524e03896831f487e5dee63f18f1c33c0115/core/res/res/values/attrs.xml