docs(cron): add dst description

[tczhao]

Resolves #4290

Signed-off-by: Tianchu Zhao evantczhao@gmail.com

Checklist:

• My organization is added to USERS.md.

[codecov]

Codecov Report

Merging #5679 (a058f71) into master (bf5d7bf) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5679      +/-   ##
==========================================
+ Coverage   47.07%   47.11%   +0.03%     
==========================================
  Files         242      242              
  Lines       15135    15135              
==========================================
+ Hits         7125     7131       +6     
+ Misses       7106     7098       -8     
- Partials      904      906       +2     

Impacted Files	Coverage Δ
cmd/argo/commands/get.go	56.31% <0.00%> (-0.65%)	⬇️
server/workflow/workflow_server.go	42.73% <0.00%> (+2.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bf5d7bf...a058f71. Read the comment docs.