BZ2073333: change SHA to sha

Author: jldohmann

modules/installation-user-infra-machines-iso.adoc

@@ -108,7 +108,7 @@ It is possible to interrupt the {op-system} installation boot process to add ker
 +
 [source,terminal]
 ----
-$ sudo coreos-installer install --ignition-url=http://<HTTP_server>/<node_type>.ign <device> --ignition-hash=SHA512-<digest> <1><2>
+$ sudo coreos-installer install --ignition-url=http://<HTTP_server>/<node_type>.ign <device> --ignition-hash=sha512-<digest> <1><2>
 ----
 <1> You must run the `coreos-installer` command by using `sudo`, because the `core` user does not have the required root privileges to perform the installation.
 <2> The `--ignition-hash` option is required when the Ignition config file is obtained through an HTTP URL to validate the authenticity of the Ignition config file on the cluster node. `<digest>` is the Ignition config file SHA512 digest obtained in a preceding step.
@@ -122,7 +122,7 @@ The following example initializes a bootstrap node installation to the `/dev/sda
 +
 [source,terminal]
 ----
-$ sudo coreos-installer install --ignition-url=http://192.168.1.2:80/installation_directory/bootstrap.ign /dev/sda --ignition-hash=SHA512-a5a2d43879223273c9b60af66b44202a1d1248fc01cf156c46d4a79f552b6bad47bc8cc78ddf0116e80c59d2ea9e32ba53bc807afbca581aa059311def2c3e3b
+$ sudo coreos-installer install --ignition-url=http://192.168.1.2:80/installation_directory/bootstrap.ign /dev/sda --ignition-hash=sha512-a5a2d43879223273c9b60af66b44202a1d1248fc01cf156c46d4a79f552b6bad47bc8cc78ddf0116e80c59d2ea9e32ba53bc807afbca581aa059311def2c3e3b
 ----
 
 . Monitor the progress of the {op-system} installation on the console of the machine.