Update doc/api/deploy_keys.md

doc/api/deploy_keys.md

@@ -212,22 +212,25 @@ group, this can be achieved quite easily with the API.
 First, find the ID of the projects you're interested in, by either listing all
 projects:
 
-```
+```bash
 curl --header 'PRIVATE-TOKEN: <your_access_token>' https://gitlab.example.com/api/v4/projects
 ```
 
-Or finding the ID of a group and then listing all projects in that group:
+Or finding the ID of a group:
 
-```
+```bash
 curl --header 'PRIVATE-TOKEN: <your_access_token>' https://gitlab.example.com/api/v4/groups
+```
 
-# For group 1234:
+Then listing all projects in that group (for example, group 1234):
+
+```bash
 curl --header 'PRIVATE-TOKEN: <your_access_token>' https://gitlab.example.com/api/v4/groups/1234
 ```
 
 With those IDs, add the same deploy key to all:
 
-```
+```bash
 for project_id in 321 456 987; do
     curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" --header "Content-Type: application/json" \
     --data '{"title": "my key", "key": "ssh-rsa AAAA..."}' https://gitlab.example.com/api/v4/projects/${project_id}/deploy_keys