Remove unused BC comment, add PHP class binding docs

The BC (backward compatibility) comment in QueryInterceptor.php was removed, as it served no meaningful purpose. Added to README.md, is a section explaining how to bind a PHP class to a query, instead of specifying an SQL file. The usage and behavior are described, with a corresponding PHP annotation example provided.

README.md

@@ -183,6 +183,16 @@ class FooRow
 
 If there is no SELECT result, it returns `404 Not Found`.
 
+### PHP class binding
+
+This Query can also be a dependency on a PHP class rather than specifying an SQL file.
+
+```php
+ #[Query("ticket_item_by_id"]
+```
+
+If the SQL file `ticket_item_by_id.sql` does not exist with such an attribute, the Query interface bound by `RowListInterfce` and `ticket_item_by_id` is executed with the arguments passed to the method The method is executed with the arguments passed to the method.
+
 ## Convert URI to Web request object
 
 With `WebQueryModule`, it converts the URI bound in the configuration into an invocation object for web access and injects it.

src/QueryInterceptor.php

@@ -59,7 +59,6 @@ public function invoke(MethodInvocation $invocation)
         try {
             $sql = ($this->fileGetContents)($filePath);
         } catch (SqlFileNotReadableException $e) {
-            // For BC
             // @codeCoverageIgnoreStart
             try {
                 $sqlQuery = $this->injector->getInstance(RowListInterface::class, $queryId);