Unify formatting of both groups and files up to 5 elements #6637
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This fixes inconsistency between rustdocs for Display of files and file groups by applying the same function formatting up to 5 elements. Also adds corresponding unit tests.
Also this is useful for the upcoming fix of #6383
Which issue does this PR close?
No concrete issue but a minor comment from the already merged PR
Rationale for this change
This seems to address minor issue in the previous PR
What changes are included in this PR?
As described above
Are these changes tested?
New tests are included in the PR
Are there any user-facing changes?
This changes file group formatting - now it's limited up to 5 files