Documentation: Changes mongo probe name from `mongo` to `mongodb`

[dm03514]

refs #563

[codecov-io]

Codecov Report

Merging #564 into master will decrease coverage by 0.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #564      +/-   ##
==========================================
- Coverage   57.08%   57.01%   -0.08%     
==========================================
  Files          44       44              
  Lines        2810     2810              
==========================================
- Hits         1604     1602       -2     
- Misses       1206     1208       +2

Impacted Files	Coverage Δ
headless_zip.js	73.33% <0%> (-2.23%)	:arrow_down:
index.js	74.86% <0%> (-0.54%)	:arrow_down:

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