docs: add missing logging flags and remove capnslog

[Mvrk08]

Description :

This PR updates the Configuration Guide to include the missing Logging flags section, as requested in parent issue #1074

The following flags have been added to match the server code in config.go:

--logger
--log-outputs
--log-level
--log-format
--enable-log-rotation
--log-rotation-config-json

Related Issue :
Fixes part of #1074

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Mvrk08
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[k8s-ci-robot]

Hi @Mvrk08. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Mvrk08]

Just to bring the attention @ronaldngounou i raised a new pr for the same open for the review based on your last remarks in #1104

[ronaldngounou]

Curious why you raised a new PR? Ok I will review.

[Mvrk08]

I encountered some issues fixing the commit history/DCO sign-off on my previous attempt, so I opted to open a fresh PR to ensure the history was clean.

[jberkus]

/ok-to-test

[k8s-ci-robot]

@Mvrk08: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-website-lint	94f58d2	link	true	/test pull-website-lint

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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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. I understand the commands that are listed here.

[ronaldngounou]

Before I start reviewing, could you please address the pull-website-lint failure here? @Mvrk08
https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/etcd-io_website/1106/pull-website-lint/2013775133998583808