docs: update README.md and remove allowlist information (#381)

plugins/shell/src/scope.rs

@@ -248,7 +248,7 @@ impl Scope {
 
     /// Open a path in the default (or specified) browser.
     ///
-    /// The path is validated against the `tauri > allowlist > shell > open` validation regex, which
+    /// The path is validated against the `plugins > shell > open` validation regex, which
     /// defaults to `^((mailto:\w+)|(tel:\w+)|(https?://\w+)).+`.
     pub fn open(&self, path: &str, with: Option<Program>) -> Result<(), Error> {
         // ensure we pass validation if the configuration has one