fix: replace {nodeid} and add helm repo update to installation docs

[mesutoezdil]

• prerequisites.md: {nodeid} replaced with
• online-installation.md: add helm repo update after helm repo add

Summary by CodeRabbit

• Documentation
  • Clarified the installation steps by adding a repository update command after adding the Helm chart source.
  • Improved the node-labeling example to use a clearer placeholder for the node name when enabling GPU support.

[hami-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mesutoezdil
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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: dd6258bb-a1fd-4981-85a2-7afe60d4c091

📥 Commits

Reviewing files that changed from the base of the PR and between a3e36d4 and eb38e92.

📒 Files selected for processing (2)

• docs/installation/online-installation.md
• docs/installation/prerequisites.md

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📝 Walkthrough

Walkthrough

The installation docs now add helm repo update after adding the Helm chart repo, and the prerequisites example changes the GPU node label placeholder from {nodeid} to <node-name>.

Changes

Installation docs updates

Layer / File(s)	Summary
Installation command examples docs/installation/online-installation.md, docs/installation/prerequisites.md	The Helm repo instructions add helm repo update, and the prerequisites example changes the node label placeholder to <node-name>.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A bunny hopped by with a joyful thump,
helm repo update gave the docs a jump.
One label got tidy, one step got bright,
Now installation hops along just right. 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the documentation updates: replacing {nodeid} and adding helm repo update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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