Update user guides instructions

[electrocucaracha]

This PR fixes some instructions describe in the Free5GC and OAI user guides, removes some trail spaces, and simplifies the get logs instructions.

[rravindran123]

When I tested yesterday, the UPF was stuck in the Init stage, @arora-sagar mentioned the documentation didnt cover the step to include the MetalLb ip-address pool configuration. Hope that is taken care off in this PR, haven't validated the testing against this updated instructions yet.

[arora-sagar]

Thanks for this PR.

I just did the testing and the comments are based on that testing for metal lb. I have to do another PR and add a section after networking to run the script ./test-infra/e2e/tests/oai/001-infra-metal-lb.sh in test-infra I will detach it from 001-infra.sh and make it a sub test of 001 test.

[arora-sagar]

I did the PR here for metal-lb issue --> nephio-project/test-infra#235

[liamfallon]

/approve
/lgtm

[nephio-prow]

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