Clear up documentation

Author: zyc9012

CHANGELOG.md

@@ -23,6 +23,10 @@ and this project adheres to
 
 ### Removed
 
+- Remove all types for engine parameters. SerpApi's
+  [documentation](https://serpapi.com/search-api) should be the only source of
+  truth for valid engines and their parameters.
+
 ## [1.1.1] - 2023-02-15
 
 ### Added

README.md

@@ -74,7 +74,7 @@ import { getJson } from "https://deno.land/x/serpapi/mod.ts";
 
 ## Features
 
-- TypeScript types such as supported parameters and function argument types.
+- TypeScript support.
 - Works out-of-the-box with [Node.js](https://www.npmjs.com/package/serpapi) and
   [Deno](https://deno.land/x/serpapi).
 - Promises and async/await support.

docs/migrating_from_google_search_results_nodejs.md

@@ -66,7 +66,7 @@ migrate over to the `serpapi` npm package.
 
 ## Added
 
-- TypeScript types for supported parameters.
+- TypeScript support.
 - First-class Promises support.
   ```js
   const json = await getJson({ engine: "google", q: "coffee" });
@@ -77,8 +77,10 @@ migrate over to the `serpapi` npm package.
   config.api_key = "new_api_key";
   config.timeout = 20000; // 20 seconds
   ```
-- Error classes (`MissingApiKeyError` and `InvalidTimeoutError`).
+- Error classes (`MissingApiKeyError`, `InvalidTimeoutError` and
+  `InvalidArgumentError`).
   ```js
   getJson({ engine: "google", api_key: "" }); // Throws `MissingApiKeyError`
   getAccount({ api_key: API_KEY, timeout: 0 }); // Throws `InvalidTimeoutError`
+  getJson("google"); // Throws `InvalidArgumentError`
   ```