The installation instruction without OLM is incorrect

[lgrateau]

The step about the "Use git clone." explain that we need to clone the v1.12.0 version.

However no tag , nor branch exist in this reposisotry.
The readme that contain this erronous information is:
https://github.com/IBM/ibm-licensing-operator/blob/latest/docs/Content/Install_without_OLM.md