Fix reference for P86C

[susilehtola]

Description

The literature reference for P86 was scrambled.

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Todos

• Developer Interest
  • [ ] Feature1
• User-Facing for Release Notes
  • [ ] Feature2

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Questions

• [ ] Question1

Status

• [x] Ready to go

[codecov-commenter]

Codecov Report

Merging #160 (a9452bc) into master (ff498cd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #160   +/-   ##
=======================================
  Coverage   50.40%   50.40%           
=======================================
  Files          89       89           
  Lines        2335     2335           
=======================================
  Hits         1177     1177           
  Misses       1158     1158           

Impacted Files	Coverage Δ
src/functionals/p86c.cpp	90.00% <ø> (ø)

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