fix broken hyperlink in README

Author: scottbale

README.md

@@ -16,7 +16,7 @@ Add the plugin to your `project.clj`:
 
 This plugin accepts the following pattern `clojure-lsp <command> "<options>"`.
 
-For more information on all available commands and options, Check the [API documentation](https://clojure-lsp.io/api/).
+For more information on all available commands and options, Check the [API documentation](https://clojure-lsp.io/api/what-is-it/).
 
 ### lein CLI