Abstract: three minor language edits

The difference between `that` and `which` is not strictly
required, but it helps clarify the difference in meaning,
which is important in science and software :).

This is best shown by an example:

* Maneage provides reproducibility, which is a good thing.

The sentence would make sense if we drop `, which is a good
thing.` The last part of the sentence is a comment rather than a
necessary part of the sentence.

* Maneage provides a quality of reproducibility that is missing
from other implementations.

The sentence would not quite make sense if we drop `that is ...`,
since we would not know what sort of quality is provided. The
fact that the quality is missing is key to the intended meaning
of the sentence.

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