Minor cosmetic improvements

Author: bgandon

README.md

@@ -91,7 +91,7 @@ Uploading a new OpenSSL source code tarball is not possible.
 
 ## Build docker image
 
-```
+```shell
 docker_user=gstack
 docker build -t "${docker_user}/openssl-source-code-resource" .
 docker push ${docker_user}/openssl-source-code-resource

ci/settings.yml

@@ -296,7 +296,7 @@ jobs:
                     type: registry-image
                     source:
                       repository: ${DOCKERHUB_REPOSITORY}
-                      tag: "$(< version/number)"
+                      tag:        "$(< version/number)"
                 \`\`\`
                 EOF
         params: