Replace some params

[maxulysse]

Replace --no_gatk_spark by --use_gatk_spark and --no_gvcf by --generate_gvcf

nf-core/sarek pull request

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• This comment contains a description of changes (with reason)
• If you've fixed a bug or added code that should be tested, add tests!
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[FriederikeHanssen]

Nice 😄

[FriederikeHanssen]

ah forgot one thing: should it be added to the usage.md?

[maxulysse]

ah forgot one thing: should it be added to the usage.md?

Good catch, most of the docs is now out of usage.md but we still have the description of the test profiles