resourceloader: Move FILTER_NOMIN annotation to the beginning of output

resourceloader: Move FILTER_NOMIN annotation to the beginning of output

This allows ResourceLoader::filter() to handle this case slightly
faster, since it searches for this annotation from the beginning.
In practice this is a negligible performance optimization, but let's
set a good example for the future.

Also tweak the comments and whitespace:
* Move comment about the FILTER_NOMIN from doc comment to code comment,
  it's an implementation detail and not meant for public documentation
* Remove duplicated documentation from the parent class
* Change whitespace to be identical in both cases

Change-Id: I624914ff28d903027ba58710708ccc3c66af9e24