[MongoDB]: Improve wording on milliseconds

[alaudazzi]

This PR proposes a better wording for the field total.ms.
Relates #123

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• Start Time: 2023-12-12T17:16:25.287+0000

• Duration: 20 min 42 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
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Classes	100.0% (3/3)	💚
Methods	96.97% (32/33)	👎 -3.03
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Package mongodb - 1.12.2 containing this change is available at https://epr.elastic.co/search?package=mongodb