doc(kubernetes): update configuring auto-instrumentation for nodejs

[atsu85]

What needs to be changed?
After this merged PR is released, documentation about no way to configure auto-instrumentations becomes outdated

What is the name + path of the page that needs changed?

• The relative path: content/en/docs/kubernetes/operator/automatic.md
• page: Kubernetes Operator / Auto-instrumentation -> Configure Automatic Instrumentation > Node.js > Excluding auto-instrumentation

Additional context:
It becomes outdated after the next release of opentelemetry-operator.

[cartermp]

Thanks, so it sounds like it can be changed to say something to the effect of:

"You can include only specific instrumentations by using the OTEL_NODE_ENABLED_INSTRUMENTATIONS environment variable. For example, here's how you can include only http and nestjs-core instrumentations:

export OTEL_NODE_ENABLED_INSTRUMENTATIONS="http,nestjs-core"

"

[IrisDyr]

working on this

[IrisDyr]

Seems that this task was already done by @atsu85 in this PR and can be closed.

[svrnm]

Ah yes, but there were some outstanding points with that PR (I assumed this issue is the follow up to that), let me double check on that.

[svrnm]

Here's what's missing but indeed that should be an issue on it's own while this one here is closed, apologies for overlooking that

#4137 (comment)

(this follow up issue is a little bit more complicated since we need to see that also the JS repo will be updated accordingly)