fix(docs): rebuild config docs

updates copy for package-lock-only and ls

PR-URL: #3435
Credit: @wraithgar
Close: #3435
Reviewed-by: @lukekarrys

docs/content/using-npm/config.md

@@ -898,8 +898,14 @@ package-locks disabled use `npm prune`.
 * Default: false
 * Type: Boolean
 
-If set to true, it will update only the `package-lock.json`, instead of
-checking `node_modules` and downloading dependencies.
+If set to true, the current operation will only use the `package-lock.json`,
+ignoring `node_modules`.
+
+For `update` this means only the `package-lock.json` will be updated,
+instead of checking `node_modules` and downloading dependencies.
+
+For `list` this means the output will be based on the tree described by the
+`package-lock.json`, rather than the contents of `node_modules`.
 
 #### `parseable`