Improve DefaultDict doc

[scls19fr]

with setup/repl macro

Closes #364
Helps #360
Replaces #365

[scls19fr]

This PR shouldn't be merged for now because Documenter.jl repl/setup macros seems to be buggy when using CRLF EOL.

After saving this default_dict.md file with LF as EOL, local build of doc is correctly rendered but using such EOL is not a correct workaround as all other files are using CRLF and git complains when adding it

warning: LF will be replaced by CRLF in docs/src/default_dict.md.
The file will have its original line endings in your working directory.

See JuliaDocs/Documenter.jl#790 and JuliaDocs/Documenter.jl#749

Waiting for @mortenpi / @fredrikekre (or others Documenter.jl contributors) to fix it

[codecov]

Codecov Report

Merging #431 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #431   +/-   ##
=======================================
  Coverage   98.19%   98.19%           
=======================================
  Files          30       30           
  Lines        1659     1659           
=======================================
  Hits         1629     1629           
  Misses         30       30

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[kmsquire]

Can you add a commit before this one, which changes all doc files to use LF instead of CRLF?

[scls19fr]

Sorry @kmsquire but I don't understand why I should do that.

Under Windows, git is replacing automatically LF with CRLF
See https://stackoverflow.com/questions/1967370/git-replacing-lf-with-crlf

Do you know a command line to do it quickly?

[fredrikekre]

Documenter v19.5 is released with the bugfix included so if that was the problem here you are good to go.