Minor doc typeset for default

[putianyi889]

julia> using Plots
help?> default

[codecov]

Codecov Report

Merging #4057 (7661a70) into master (acb5d5a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4057   +/-   ##
=======================================
  Coverage   62.13%   62.13%           
=======================================
  Files          29       29           
  Lines        7286     7286           
=======================================
  Hits         4527     4527           
  Misses       2759     2759           

Impacted Files	Coverage Δ
src/args.jl	72.10% <ø> (ø)
src/types.jl	47.82% <0.00%> (-4.35%)	⬇️
src/backends/gr.jl	88.36% <0.00%> (+0.08%)	⬆️

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[t-bltg]

Thanks !