lib_nbgl: Minor comments fix

[xchapron-ledger]

Description

lib_nbgl: Minor comments fix

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 59.89%. Comparing base (102534f) to head (7136bad).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   59.89%   59.89%           
=======================================
  Files          12       12           
  Lines        1688     1688           
=======================================
  Hits         1011     1011           
  Misses        677      677           

Flag	Coverage Δ
unittests	59.89% <ø> (ø)

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