Fix YAML and JSON doc section
@@ -1269,6 +1269,7 @@ changes resulting in well-formed target groups are applied.
Files must contain a list of static configs, using these formats:
**JSON**
+
```json
[
{
@@ -1282,6 +1283,7 @@ Files must contain a list of static configs, using these formats:
```
**YAML**
+
```yaml
- targets:
[ - '<host>' ]
