cmd/lava/internal/help: update references to metrics file

cmd/lava/internal/help/helpdoc.go

@@ -141,9 +141,6 @@ the following properties.
   - format: output format. Valid values are "human" and "json". If not
     specified, "human" is used.
   - output: path of the output file. If not specified, stdout is used.
-  - metrics: path of the file where the metrics report will be
-    written. If not specified, then the metrics report is not
-    generated. For more details, use "lava help metrics".
   - exclusions: list of rules that define what findings should be
     excluded from the report. It allows to ignore findings because of
     accepted risks, false positives, etc.
@@ -154,8 +151,7 @@ The sample below is a full report configuration:
 	  severity: high
 	  show: low
 	  format: json
-	  output: findings.json
-	  metrics: metrics.json
+	  output: output.json
 	  exclusions:
 	    - description: Ignore test certificates.
 	      summary: 'Secret Leaked in Git Repository'
@@ -199,7 +195,7 @@ with security, operational and configuration information. This data is
 serialized as JSON.
 
 For more details about how to enable this functionality, use "lava
-help lava.yaml".
+help scan" and "lava help run".
 
 # Example