Modify log message to fit example command

Signed-off-by: Tyler Reid <tyler.reid@grafana.com>

Author: Tyler Reid

cortex-mixin/docs/playbooks.md

@@ -372,7 +372,7 @@ How to **investigate**:
 The compactor may fail to compact blocks due a corrupted block index found in one of the source blocks:
 
 ```
-level=error ts=2020-07-12T17:35:05.516823471Z caller=compactor.go:339 component=compactor msg="failed to compact user blocks" user=REDACTED err="compaction: group 0@6672437747845546250: block with not healthy index found /data/compact/0@6672437747845546250/REDACTED; Compaction level 1; Labels: map[__org_id__:REDACTED]: 1/1183085 series have an average of 1.000 out-of-order chunks: 0.000 of these are exact duplicates (in terms of data and time range)"
+level=error ts=2020-07-12T17:35:05.516823471Z caller=compactor.go:339 component=compactor msg="failed to compact user blocks" user=REDACTED-TENANT err="compaction: group 0@6672437747845546250: block with not healthy index found /data/compact/0@6672437747845546250/REDACTED-BLOCK; Compaction level 1; Labels: map[__org_id__:REDACTED]: 1/1183085 series have an average of 1.000 out-of-order chunks: 0.000 of these are exact duplicates (in terms of data and time range)"
 ```
 
 When this happen you should: