Use indentation of 2 when rewriting auto-migrated config file

[stefanhaller]

• PR Description

Use indentation of 2 when rewriting auto-migrated config file. This seems to be what most people use when indenting yaml files, and it seems to make more sense than the default of 4. We also use it the example config in Config.md.

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for 1e050551	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1e05055)	Report Missing	Report Missing	Report Missing
Head commit (87c3e75)	53088	45986	86.62%

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4312)	12	12	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[ChrisMcD1]

Oh sweet, didn't know it would be this easy!

[stefanhaller]

@jesseduffield I'm going to merge this, I hope you are fine with Chris' review.

I wasn't sure what label to assign, I picked "ignore-for-release" for now as I don't find it super important to mention it in release notes, but feel free to assign another one that you find more appropriate.