[Spike] Investigate documentation updates for pod - container overrides

[thepetk]

Which area is this issue related to?

/area library
/area landing-page

Issue Description

The current version of the devfile.io documentation for the pod / container overrides is here: https://devfile.io/docs/2.2.0/overriding-pod-and-container-attributes.

This spike issue focuses on the following:

• Check if any documentation update is needed for the current section, especially for not allowing pod/container overrides with volume/volumeMount.
• Update the education modules by mention explicitly the reason of not including the volume / volumeMount in the pod/container overrides.

Acceptance Criteria

• Documentation in devfile.io and education modules are up-to-date

[github-actions]

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