chore: fix minor spacing issues

[felixpernegger]

Done via regex. Replaces \w ] with \w] basically.

I have previously been adviced against PRs like this due to a future autoformatter, but:

• This PR is very easy to review

• It is not clear to me at all an autoformatter would include this

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[felixpernegger]

easy

[github-actions]

PR summary 7378cd9a10

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 (regex)

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

You can run this locally as follows

## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

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

## more verbose report:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

Declarations diff (Lean)

✅ Lean-aware diff — post-build, computed from the Lean environment (commit 7378cd9).

• +0 new declarations
• −0 removed declarations

No declaration differences.

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No changes to strong technical debt.

No changes to weak technical debt.

Current commit 7378cd9a10
Reference commit abea25c40f

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/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]

It is not clear to me at all an autoformatter would include this

We can find out by asking the author:
@hargoniX is the autoformatter going to include changes like this PR from the start? (My impression certainly is that this would be possible to implement, it is a kind of syntax canonisation pass after all.)