Update tracing docs with OTel changes

[dprotaso]

Updating the docs with OTel changes

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[dprotaso]

/assign @Cali0707

[dprotaso]

/cherry-pick release-1.19

[knative-prow-robot]

@dprotaso: once the present PR merges, I will cherry-pick it on top of release-1.19 in a new PR and assign it to you.

Details

In response to this:

/cherry-pick release-1.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Cali0707]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, dprotaso

The full list of commands accepted by this bot can be found here.

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• OWNERS [Cali0707,dprotaso]

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[knative-prow-robot]

@dprotaso: #6337 failed to apply on top of branch "release-1.19":

Applying: Update tracing documentary for OTel
.git/rebase-apply/patch:157: trailing whitespace.
## Accessing traces 
.git/rebase-apply/patch:265: trailing whitespace.
Traces give us the big picture of what happens when a request is made to an application. 
warning: 2 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	docs/eventing/accessing-traces.md
M	docs/serving/accessing-traces.md
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): docs/serving/accessing-traces.md deleted in Update tracing documentary for OTel and modified in HEAD. Version HEAD of docs/serving/accessing-traces.md left in tree.
Auto-merging docs/eventing/observability/accessing-traces.md
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Update tracing documentary for OTel

Details

In response to this:

/cherry-pick release-1.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.