Fix typo in github role README

Author: markgoddard

roles/github/README.md

@@ -46,7 +46,7 @@ The following variables can be used to make small adjustments to the composition
 
 `github_image_tag`: tag used to select kayobe image defaults to `latest`
 
-`github_registry`: dictionary containing keys that correspond to `url`, `username`, `password` and `share` for the registry to be used by the workflows. By default it use repository varialbes and settings `REGISTRY_URL`, `REGISTRY_USERNAME`, `REGISTRY_PASSWORD`. The key `share` is to indiciate if the registry is shared between environments.
+`github_registry`: dictionary containing keys that correspond to `url`, `username`, `password` and `share` for the registry to be used by the workflows. By default it uses repository variables and settings `REGISTRY_URL`, `REGISTRY_USERNAME`, `REGISTRY_PASSWORD`. The key `share` is to indiciate if the registry is shared between environments.
 
 `github_kayobe_base_image`: select the base image used when building the kayobe docker image. Default is `quay.io/centos/centos:stream8` supports OpenStack Wallaby, Xena and Yoga. Zed and higher would require `quay.io/rockylinux/rockylinux:9`.