add headers to different examples in logging configuration
@@ -22,6 +22,8 @@ The following options are available in the `log` section:
A single configurable backend is supported.
+
+### Output to stdout
```yaml
log:
output: stdout
@@ -29,6 +31,7 @@ log:
format: plain
```
+### Output to a file
```yaml
log:
output:
