[Merged by Bors] - chore(*): address a few porting notes in concrete categories

[Vierkantor]

A not particularly exhaustive fix of a few porting notes in Algebra/Category, AlgebraicGeometry, AlgebraicTopology and Topology/Category.

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[github-actions]

PR summary b3a30d9f62

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

+ instance {X : Compactum} : TopologicalSpace X
- instance {X : Compactum} : TopologicalSpace X.A

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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Decrease in tech debt: (relative, absolute) = (5.52, 0.01)

Current number	Change	Type
3602	-15	porting notes
1339	-2	erw

Current commit b3a30d9f62
Reference commit 40649a9379

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).

[kim-em]

bors merge

[mathlib-bors]

Pull request successfully merged into master.

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