* added more explanation to the sharding section for it to be more
understandable what it is and what it's purpose.
* because from the explanation in the docs. - it sound like that a
"shard" is a machine that is provided by playwright in addition to the
current setup , like a managed machine, but in reality it is simply a
separate job in the CI, dividing tests to separate jobs is sharding,
which sounds a lot easier when you think about it this way because it
could be confusing at the beginning IMO.
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