Fixes minor typo in doc-string for gp

[dmclark17]

No description provided.

[codecov-commenter]

Codecov Report

Merging #179 into master will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   58.47%   58.43%   -0.05%     
==========================================
  Files          35       35              
  Lines        7533     7523      -10     
==========================================
- Hits         4405     4396       -9     
+ Misses       3128     3127       -1     

Impacted Files	Coverage Δ
flare/gp.py	78.27% <ø> (ø)
flare/otf.py	91.61% <ø> (+0.09%)	⬆️
flare/predict.py	89.31% <100.00%> (ø)

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