Apply suggestions from code review

Co-authored-by: Michael Schurter <mschurter@hashicorp.com>

command/operator_raft_info.go

@@ -18,7 +18,10 @@ func (c *OperatorRaftInfoCommand) Help() string {
 	helpText := `
 Usage: nomad operator raft _info <path to nomad data dir>
 
-  Displays info about the raft logs in the data directory
+  Displays info about the raft logs in the data directory.
+  
+  This is a low-level debugging tool and not subject to Nomad's usual backward
+  compatibility guarantees.
 `
 	return strings.TrimSpace(helpText)
 }

command/operator_raft_state.go

@@ -23,7 +23,7 @@ Usage: nomad operator raft _state <path to nomad data dir>
 
 Options:
 
-  --last-index=<last_index>
+  -last-index=<last_index>
     Set the last log index to be applied, to drop spurious log entries not
     properly committed. If passed last_index is zero or negative, it's perceived
     as an offset from the last index seen in raft.
@@ -73,7 +73,7 @@ func (c *OperatorRaftStateCommand) Run(args []string) int {
 	} else if _, err := os.Stat(filepath.Join(args[0], "raft.db")); err == nil {
 		p = args[0]
 	} else {
-		c.Ui.Error("path needs to be a data dir path with raft.db file")
+		c.Ui.Error(fmt.Sprintf("path needs to be a data dir path with raft.db file: %v", err))
 		return 1
 	}