docs: fix markdown lint error

[sysulq]

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[codecov-commenter]

Codecov Report

Merging #524 (de40d9c) into master (077b583) will decrease coverage by 0.16%.
The diff coverage is n/a.

❗ Current head de40d9c differs from pull request most recent head 98e02ce. Consider uploading reports for the commit 98e02ce to get more accurate results

@@            Coverage Diff             @@
##           master     #524      +/-   ##
==========================================
- Coverage   50.96%   50.80%   -0.17%     
==========================================
  Files         105      105              
  Lines        6753     6753              
==========================================
- Hits         3442     3431      -11     
- Misses       3058     3067       +9     
- Partials      253      255       +2     

Impacted Files	Coverage Δ
pkg/registry/etcdv3/registry.go	70.34% <0.00%> (-3.80%)	⬇️

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