Add jacobian_tangent_basis to docstring

[blegat]

I was confused when reading

then the keyword jacobian_tangent_basis below is ignored

since there was no such keyword below.

[codecov[bot]]

Codecov Report

Merging #304 (d16c731) into master (c4bc49d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #304   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          77       77           
  Lines        7087     7087           
=======================================
  Hits         7069     7069           
  Misses         18       18           

Files	Coverage Δ
src/solvers/LevenbergMarquardt.jl	100.00% <ø> (ø)

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