Fix precompilation error for 1.6-DEV

[tkf]

Commit Message

Fix precompilation error for 1.6-DEV (#34)

This patch workarounds the change in Julia 1.6-DEV
JuliaLang/julia#37771
i.e., @doc SubModule "..." outside SubModule stopped working.

This patch avoids the precompilation error by simply inlining Extras
docstring.

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 2.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   75.53%   77.86%   +2.33%     
==========================================
  Files           5        5              
  Lines         233      244      +11     
==========================================
+ Hits          176      190      +14     
+ Misses         57       54       -3     

Flag	Coverage Δ
#unittests	77.86% <ø> (+2.33%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core.jl	94.73% <0.00%> (+0.29%)	⬆️
src/something.jl	97.05% <0.00%> (+0.39%)	⬆️
src/lift.jl	93.12% <0.00%> (+1.06%)	⬆️
src/extras.jl	88.88% <0.00%> (+12.41%)	⬆️

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