blog: fix old pre formatting markdown

Signed-off-by: Dan van der Ster <dan.vanderster@clyso.com>

Author: dvanders

src/en/news/blog/2018/new-mimic-centralized-configuration-management/index.md

@@ -75,22 +75,24 @@ priority order that Ceph uses to set options is:
 
 Typing _ceph config -h_ will summarize the set of commands available:
 
-> $ ceph config -h
-> \[...\]
-> config assimilate-conf                          Assimilate options from a conf, and return a 
->                                                  new, minimal conf file
-> config dump                                     Show all configuration option(s)
-> config get <who> {<key>}                        Show configuration option(s) for an entity
-> config help <key>                               Describe a configuration option
-> config log {<int>}                              Show recent history of config changes
-> config reset <int>                              Revert configuration to previous state
-> config rm <who> <name>                          Clear a configuration option for one or more 
->                                                  entities
-> config set <who> <name> <value>                 Set a configuration option for one or more 
->                                                  entities
-> config show <who> {<key>}                       Show running configuration
-> config show-with-defaults <who>                 Show running configuration (including compiled-
->                                                  in defaults)
+```bash
+$ ceph config -h
+\[...\]
+config assimilate-conf                          Assimilate options from a conf, and return a 
+                                                 new, minimal conf file
+config dump                                     Show all configuration option(s)
+config get <who> {<key>}                        Show configuration option(s) for an entity
+config help <key>                               Describe a configuration option
+config log {<int>}                              Show recent history of config changes
+config reset <int>                              Revert configuration to previous state
+config rm <who> <name>                          Clear a configuration option for one or more 
+                                                 entities
+config set <who> <name> <value>                 Set a configuration option for one or more 
+                                                entities
+config show <who> {<key>}                       Show running configuration
+config show-with-defaults <who>                 Show running configuration (including compiled-
+                                                 in defaults)
+```
 
 A good place to start is simply dumping the cluster configuration: