docs: pull beats doc changes into APM

[bmorelli25]

Motivation/summary

This PR syncs APM documentation with Beats documentation.

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #4476 updated

• Start Time: 2020-12-07T17:57:15.021+0000

• Duration: 46 min 49 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4621
Skipped	139
Total	4760

Steps errors

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Run Window tests

• Took 9 min 59 sec . View more details on here

Compress

• Took 0 min 0 sec . View more details on here
• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

Compress

• Took 0 min 0 sec . View more details on here
• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

Test Sync

• Took 3 min 9 sec . View more details on here
• Description: ./.ci/scripts/sync.sh

[bmorelli25]

jenkins retest this please

[codecov-io]

Codecov Report

Merging #4476 (c586225) into master (6062235) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4476      +/-   ##
==========================================
+ Coverage   75.91%   75.96%   +0.05%     
==========================================
  Files         161      161              
  Lines        9790     9790              
==========================================
+ Hits         7432     7437       +5     
+ Misses       2358     2353       -5     

Impacted Files	Coverage Δ
kibana/connecting_client.go	70.17% <0.00%> (+8.77%)	⬆️

[axw]

Thanks!