fixup: add docs

docs/lib/content/commands/npm-query.md

@@ -133,19 +133,25 @@ npm query ":type(git)" | jq 'map(.name)' | xargs -I {} npm why {}
   },
   ...
 ```
-### Package lock only mode
 
-If package-lock-only is enabled, only the information in the package
-lock (or shrinkwrap) is loaded.  This means that information from the
-package.json files of your dependencies will not be included in the
-result set (e.g. description, homepage, engines).
+### Expecting a certain number of results
+
+One common use of `npm query` is to make sure there is only one version of
+a certain dependency in your tree.  This is especially common for
+ecosystems like that rely on `typescript` where having state split
+across two different but identically-named packages causes bugs.  You
+can use the `--expect-results` or `--expect-result-count` in your setup
+to ensure that npm will exit with an exit code if your tree doesn't look
+like you want it to.
+
+
+```sh
+$ npm query '#react' --expect-result-count=1
+```
 
 ### Package lock only mode
 
-If package-lock-only is enabled, only the information in the package
-lock (or shrinkwrap) is loaded.  This means that information from the
-package.json files of your dependencies will not be included in the
-result set (e.g. description, homepage, engines).
+If package-lock-only is enabled, only the information in the package lock (or shrinkwrap) is loaded.  This means that information from the package.json files of your dependencies will not be included in the result set (e.g. description, homepage, engines).
 
 ### Configuration