docs: APM "Personal data" built-in data filter doc needs an update

[mlliarm]

Hello,

In the documentation it writes:

The capturing of this data can be turned off by setting Capture personal data to false.

Here's the flag mentioned in the quote, within Integrations > Elastic APM > Elastic APM:

But the quote isn't accurate, as the capturing of client data such as client.ip cannot be deactivated and as a result such data appear in the logs.

As of now the only way to block such information entering the logs is reducting it using a filter on the client side.

So, the above line can be confusing as a user might expect that by switching the "Capture personal data" to false no personal data such as client.ip will go through the APM server into Kibana.

Summing up, I believe there should be a more explicit explanation of what is not being captured when this flag is deactivated.

Thanks