style(Order): fix whitespace

[grunweg]

Extracted from #30658. Found by extending the commandStart linter to proof bodies.

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[github-actions]

PR summary 7c64d37d34

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[grunweg]

Thanks for doing this work, Damiano. I like all changes which are not related to removing a space before not, but am on the fence about most of those. Let me split this PR in two, and bors r+ the "good" half.

[grunweg]

#30762 is the good subset, which I've just borsed

[JovanGerb]

I agree that for the spacing after not, there is no clear consensus on what is the preferred form. I'd like it if we picked one style and applied it consistently. But maybe we should ask others what they think.

[mathlib4-merge-conflict-bot]

This pull request has conflicts, please merge master and resolve them.

[grunweg]

The remaining changes in this PR are undesirable: closing.