tools: restart puma instead of unicorn after installing themes/plugins

supervisord only manages a puma program; the leftover unicorn reference
made these scripts fail their restart step after a successful install.
Also fixes copy-pasted comments describing them as backup scripts.

Author: jcormier

assets/tools/redmine-install-plugins

@@ -1,10 +1,10 @@
 #!/bin/bash
-## Script to generate backup of running Redmine instance from the BASH shell
+## Script to install plugins on a running Redmine instance from the BASH shell
 
 set -e
 source ${REDMINE_RUNTIME_ASSETS_DIR}/functions
 
 install_plugins
 
-# Restart unicorn
-supervisorctl restart unicorn
+# Restart puma
+supervisorctl restart puma

assets/tools/redmine-install-themes

@@ -1,10 +1,10 @@
 #!/bin/bash
-## Script to generate backup of running Redmine instance from the BASH shell
+## Script to install themes on a running Redmine instance from the BASH shell
 
 set -e
 source ${REDMINE_RUNTIME_ASSETS_DIR}/functions
 
 install_themes
 
-# Restart unicorn
-supervisorctl restart unicorn
+# Restart puma
+supervisorctl restart puma