add some training data with examples with docs containing highlights

[Aazhar]

some documents contains highlights in the first page, this part is confused with the abstract, I'm submitting some training data for this case

[coveralls]

coverage: 40.868%. remained the same
when pulling bf10740 on added_training_data_for_examples_highlights
into 4c85ab0 on master.

[lfoppiano]

HI @achrafazharccsd apologize for checking this 2 years in late.

There is a problem with these articles, both of them are not CC-BY. The Cell's one is CC-BY-ND-NC (ND = Non derivative), which does not allow derivative work. The Pacman is not CC. So both of them cannot be really added to the grobid public data.

Also the annotation require some correction (I checked them before realising the licence), If you have some equivalent articles that are CC-BY, I'm happy to help you with the training data and providing an updated model for it.