[7.x] [DOCS] Fixes URLs on Secure communication with APM Agents page (#4746)

[szabosteve]

Backports the following commits to 7.x:

• [DOCS] Fixes URLs on Secure communication with APM Agents page ([DOCS] Fixes URLs on Secure communication with APM Agents page #4746)

[codecov-io]

Codecov Report

Merging #4749 (5fe7933) into 7.x (bfa6140) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              7.x    #4749      +/-   ##
==========================================
- Coverage   75.92%   75.89%   -0.04%     
==========================================
  Files         161      161              
  Lines        9791     9791              
==========================================
- Hits         7434     7431       -3     
- Misses       2357     2360       +3     

Impacted Files	Coverage Δ
kibana/connecting_client.go	61.40% <0.00%> (-8.78%)	⬇️
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.36% <0.00%> (ø)
processor/otel/consumer.go	93.28% <0.00%> (+0.44%)	⬆️

[apmmachine]

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Build stats

• Build Cause: Pull request #4749 opened

• Start Time: 2021-02-17T10:43:13.151+0000

• Duration: 28 min 46 sec

• Commit: 5fe7933

Test stats 🧪

Test	Results
Failed	0
Passed	4373
Skipped	123
Total	4496

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• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

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• Description: ./.ci/scripts/sync.sh