Minor nbgl doc fixes

[tdejoigny-ledger]

Description

Minor nbgl doc fixes

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.88%. Comparing base (4141b77) to head (ceee4d4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #754   +/-   ##
=======================================
  Coverage   59.88%   59.88%           
=======================================
  Files          12       12           
  Lines        1710     1710           
=======================================
  Hits         1024     1024           
  Misses        686      686           

Flag	Coverage Δ
unittests	59.88% <ø> (ø)

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