Minor: improve testing docs, mention cargo nextest
#13160
Merged
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Which issue does this PR close?
Follow up to #13045
Rationale for this change
Suggested by @Omega359 and @find on #13045 (comment) let's make it more likely someone finds / uses the improvements in #13045
What changes are included in this PR?
cargo nextest
Are these changes tested?
Are there any user-facing changes?