fix tutorial 6 code

[razetime]

PR Checklist

If you are contributing to Javis.jl, please make sure you are able to check off each item on this list:

• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
• Did I make sure to only change the part of the file where I introduced a new change/feature?
• Did I cover all corner cases to be close to 100% test coverage (if applicable)?
• Did I properly add Javis dependencies to the Project.toml + set an upper bound of the dependency (if applicable)?
• Did I properly add test dependencies to the test directory (if applicable)?
• Did I check relevant tutorials that may be affected by changes in this PR?
• Did I clearly articulate why this PR was made the way it was and how it was made?

Link to relevant issue(s)
Closes #476

The function info_box was changed to support a keyword argument.

[codecov-commenter]

Codecov Report

Merging #477 (6a08113) into main (91ded55) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   96.41%   96.40%   -0.02%     
==========================================
  Files          35       35              
  Lines        1618     1613       -5     
==========================================
- Hits         1560     1555       -5     
  Misses         58       58              

Impacted Files	Coverage Δ
src/Javis.jl	96.80% <0.00%> (-0.08%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 91ded55...6a08113. Read the comment docs.

[Wikunia]

Thanks for the fix @razetime and sorry for the late merge.