[ENH] Remove redundant entity definitions on MRI page

[tsalo]

Related to #612.

This PR removes any paragraphs describing entities, wherein the description does not differ appreciably from, or expand upon, the official entity definition in the schema, from the MRI page.

[codecov]

Codecov Report

Merging #1265 (a25114a) into master (8b53807) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1265      +/-   ##
==========================================
+ Coverage   87.95%   88.18%   +0.22%     
==========================================
  Files           6        6              
  Lines        1038     1041       +3     
==========================================
+ Hits          913      918       +5     
+ Misses        125      123       -2     

Impacted Files	Coverage Δ
tools/schemacode/bidsschematools/render.py	92.56% <100.00%> (+0.53%)	⬆️

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[Remi-Gau]

LGTM

Thanks for this refactoring @tsalo

Had a quick look I think that there may be a paragraph or 2 we could similarly remove from PET or microscopy in another PR.

[tsalo]

Had a quick look I think that there may be a paragraph or 2 we could similarly remove from PET or microscopy in another PR.

Absolutely! I definitely want to work through the rest of the spec to remove anything unnecessary.