Update npm-audit.md

--parseable is left from v6 and is not supported in v7. It was removed from the docs further down and thus should also not be used further up in the Synopsis.
Compare: https://docs.npmjs.com/cli/v6/commands/npm-audit

PR-URL: #2179
Credit: @Primajin
Close: #2179
Reviewed-by: @ruyadorno

docs/content/commands/npm-audit.md

@@ -7,8 +7,8 @@ description: Run a security audit
 ### Synopsis
 
 ```bash
-npm audit [--json|--parseable|--audit-level=(low|moderate|high|critical)]
-npm audit fix [--force|--package-lock-only|--dry-run]
+npm audit [--json] [--production] [--audit-level=(low|moderate|high|critical)]
+npm audit fix [--force|--package-lock-only|--dry-run|--production|--only=(dev|prod)]
 
 common options: [--production] [--only=(dev|prod)]
 ```