Is it just me or are some of the inspection validations nonsense?
This is in a fresh Magento 2 install:

Really, PHPStorm should understand the context of this word... it's not an outputted-to-user word, it's a string in a composer.json file... spelling it "correctly" (however PHPStorm thinks it should be spelled) would break the file. It seems JetBrains should code in a context check for the spellchecker.
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Hello,
Right now you can do it manually yourself:
1) "Settings | Appearance & Behavior | Scopes" and create new scope – include all desired files there (composer.json)
2) "Settings | Editor | Inspections | Spelling" – click scopes list (default value is "In All Scopes") and choose the scope created in the previous step. Once done – disable inspection for desired scope.