Fix inline math for docstring

[JaydevSR]

Escaping not required as using @doc raw.

[JaydevSR]

I seem to be missing a lot of such small things 😮‍💨

[codecov[bot]]

Codecov Report

Merging #91 (503fc77) into master (48cc4a3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   83.71%   83.71%           
=======================================
  Files          31       31           
  Lines        3678     3678           
=======================================
  Hits         3079     3079           
  Misses        599      599           

Impacted Files	Coverage Δ
src/interactions/coulomb.jl	70.21% <ø> (ø)
src/interactions/lennard_jones.jl	81.19% <ø> (ø)
src/force.jl	82.35% <0.00%> (ø)

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[jgreener64]

We all miss such things.