doc(RingTheory): avoid lazy continuation lines

[harahu]

We resolve the ambiguity inherent in lazy (un-indented) list item continuation lines by either indenting them or separating them by inserting a newline in the cases where the item continuation was a mistake.

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[github-actions]

PR summary 865d150803

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/pr_summary/declarations_diff.sh <optional_commit>

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

The doc-module for scripts/pr_summary/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/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]

LGTM, except for one comment. Thanks!
bors d+

[grunweg]

I'd remove this one --- the following paragraph is not part of the enumeration, but belongs together with the previous items.

[mathlib-bors]

✌️ harahu can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.