docs: update

Author: brettz9

docs/rules/valid-types.md

@@ -846,5 +846,9 @@ function quux() {
 
 }
 // Settings: {"jsdoc":{"mode":"typescript"}}
+
+/**
+ * @returns {Promise<{publicKey, privateKey}>} - The public and private key
+ */
 ````
 

src/bin/generateDocs.js

@@ -258,7 +258,7 @@ const assertDocsAreUpToDate = async () => {
     const isUpToDate = fs.readFileSync(docPath, 'utf8') === docContent;
 
     if (!isUpToDate) {
-      throw new Error('Readme is not up to date, please run `npm run create-docs` to update it.');
+      throw new Error('Docs are not up to date, please run `npm run create-docs` to update it.');
     }
   }
 };