[ENH] Use "Tag XXXX, YYYY" not "Tag (XXXX,YYYY)" for DICOM Tags

[yarikoptic]

In general I like more (XXXX,YYYY) form but the other form more prevalent and thus what I also suggested in https://github.com/bids-standard/bids-specification/pull/1450/files

Attention to this was triggered by @CPernet 's comment in

• [ENH] Add explicit wording on DICOM terms correspondence #1450 (comment)

src/schema/objects/metadata.yaml and src/schema/rules/checks/asl.yaml src/schema/rules/sidecars/mri.yaml all use form without () and pet sometimes only used with ()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.93%. Comparing base (bd08602) to head (9027f38).
Report is 39 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1758   +/-   ##
=======================================
  Coverage   87.93%   87.93%           
=======================================
  Files          16       16           
  Lines        1351     1351           
=======================================
  Hits         1188     1188           
  Misses        163      163           

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[yarikoptic]

@bids-standard/maintainers ping on this trivial PR.

[Remi-Gau]

@tsalo @effigies forgot to mention this light PR to reveiw yesterday