Minor doc updates and fix bug in sparse_jacobian default option

[sebapersson]

Closes #246

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.04%. Comparing base (c4ab9a5) to head (38c7cbd).
Report is 3 commits behind head on main.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files          61       61           
  Lines        3929     3930    +1     
=======================================
+ Hits         3577     3578    +1     
  Misses        352      352           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.