Update 1.2 branch of docs to have the correct versions in code snippets

[karayim]

Bug description:

When installing TAP from the docs, the user will experience failures because the wrong version is called out in the code snippets.

Steps to reproduce:

Go to https://github.com/pivotal/docs-tap/tree/1-2/tap-gui to update the docs.

An example where the wrong value is used in step 3.
https://docs.vmware.com/en/VMware-Tanzu-Application-Platform/1.2/tap/GUID-scc-install-ootb-delivery-basic.html
The version listed is --version 0.7.0
The version should be --version 0.8.0-build.4
(check all OOTB pages for the same problem)

The value is wrong in Install step 2 here.
https://docs.vmware.com/en/VMware-Tanzu-Application-Platform/1.2/tap/GUID-scc-install-scc.html
The version listed is --version 0.4.0
The version should be --version 0.4.2