installing odo documents changes for IBM Z platform

[PanYaLian]

/kind documentation

What mistake did you find / what is missing in the documentation?

Here is the link for installing odo, https://odo.dev/docs/installing-odo/, and I think it is from https://github.com/openshift/odo/blob/master/docs/public/installing-odo.adoc. since we have add IBM Z support for odo, we hope to update the doc to include some instructions for installing odo on IBM Z

What is the relevance of it?

[PanYaLian]

/area system-pz

[jichenjc]

@PanYaLian can we be more specific on what we hope to change and what's the proposal etc if you have ?

[PanYaLian]

just like what we did on odo 1.2.5 for Z, add the following content for installing odo on Linux on IBM Z and LinuxONE
@zhengxiaomei123 you mentioned in #3725 (comment) that it is not required since "the v2.0.0-alpha of odo is not available for s390x, tips are required for user." Now we have already pass CI test on odo 2.0 -alpha, do we need to modify the doc now?

Installing odo on Linux on IBM Z and LinuxONE
Binary installation
# curl -L https://github.com/openshift/odo/releases/download/v2.0.0-alpha-2/odo-linux-s390x -o /usr/local/bin/odo
# chmod +x /usr/local/bin/odo

[PanYaLian]

Done