corrected several docstrings

[IainHammond]

updated docstrings in fm and bad pixel correction modules to reflect new, changed or removed variables

[codecov-commenter]

Codecov Report

Merging #559 (06f6761) into master (9b100a2) will not change coverage.
The diff coverage is 88.89%.

@@           Coverage Diff           @@
##           master     #559   +/-   ##
=======================================
  Coverage   64.14%   64.14%           
=======================================
  Files          56       56           
  Lines       11775    11775           
=======================================
  Hits         7552     7552           
  Misses       4223     4223           

Impacted Files	Coverage Δ
vip_hci/fm/negfc_mcmc.py	70.05% <ø> (ø)
vip_hci/preproc/recentering.py	66.96% <ø> (ø)
vip_hci/var/fit_2d.py	51.95% <ø> (ø)
vip_hci/preproc/badpixremoval.py	63.11% <88.89%> (ø)

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[VChristiaens]

Thanks @IainHammond !