Update opentelemetry.rst

[poulsbopete]

We need to evangelize OTLP for metrics and traces coming from the OpenTelemetry vendors page - https://opentelemetry.io/ecosystem/vendors/. Splunk O11Y should be as easy as adding an OTLP endpoint + token.

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[theletterf]

@poulsbopete Thanks for opening this PR. Unfortunately, this is the wrong location for the text, so I'll have to close the PR. Bear in mind that we're already documenting the OTLP components: https://docs.splunk.com/observability/en/gdi/opentelemetry/components/otlphttp-exporter.html (feel free to edit that doc if you want, it's still fairly new!)

In general, we'll want to approach this from a distribution point of view. I suggest that you reach out to @aunshc about this, as any change in the happy path will have to go through the default config files first.

[poulsbopete]

Understood and I will reach out to @aunshc. My goal is to improve the clarity coming from the OpenTelemetry Vendors list (https://opentelemetry.io/ecosystem/vendors/) to Splunk. It should not be a "let's install Splunk OTel" but rather be as easy as all the other vendors - put in your OTLP endpoint, and you are ready to go with Splunk O11Y. If you want Profiling, then install Splunk OTel. I do really like the new OTLP page you referenced, that is the very first updated page I have found!