Rename severity configuration to allow its name to be inferred

[SimplyDanny]

No description provided.

[SwiftLintBot]

	1 Warning
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

	17 Messages
📖	Linting Aerial with this PR took 0.78s vs 0.81s on main (3% faster)
📖	Linting Alamofire with this PR took 1.13s vs 1.14s on main (0% faster)
📖	Linting Brave with this PR took 6.64s vs 6.5s on main (2% slower)
📖	Linting DuckDuckGo with this PR took 3.53s vs 3.52s on main (0% slower)
📖	Linting Firefox with this PR took 9.21s vs 9.07s on main (1% slower)
📖	Linting Kickstarter with this PR took 7.98s vs 7.95s on main (0% slower)
📖	Linting Moya with this PR took 0.46s vs 0.49s on main (6% faster)
📖	Linting NetNewsWire with this PR took 2.33s vs 2.34s on main (0% faster)
📖	Linting Nimble with this PR took 0.66s vs 0.65s on main (1% slower)
📖	Linting PocketCasts with this PR took 6.86s vs 6.82s on main (0% slower)
📖	Linting Quick with this PR took 0.32s vs 0.33s on main (3% faster)
📖	Linting Realm with this PR took 4.05s vs 4.22s on main (4% faster)
📖	Linting Sourcery with this PR took 2.03s vs 2.08s on main (2% faster)
📖	Linting Swift with this PR took 3.88s vs 3.87s on main (0% slower)
📖	Linting VLC with this PR took 1.08s vs 1.11s on main (2% faster)
📖	Linting Wire with this PR took 14.4s vs 14.65s on main (1% faster)
📖	Linting WordPress with this PR took 9.41s vs 9.41s on main (0% slower)

Here's an example of your CHANGELOG entry:

* Rename severity configuration to allow its name to be inferred.  
  [SimplyDanny](https://github.com/SimplyDanny)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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