Add an example with non-empty tag

Author: Yuki Kobayashi

Doc/library/ast.rst

@@ -1783,6 +1783,16 @@ Type annotations
                   value=Constant(value=1))],
           type_ignores=[
               TypeIgnore(lineno=1, tag='')])
+      >>> print(ast.dump(ast.parse('x: bool = 1 # type: ignore[assignment]', type_comments=True), indent=4))
+      Module(
+          body=[
+              AnnAssign(
+                  target=Name(id='x', ctx=Store()),
+                  annotation=Name(id='bool', ctx=Load()),
+                  value=Constant(value=1),
+                  simple=1)],
+          type_ignores=[
+              TypeIgnore(lineno=1, tag='[assignment]')])
 
    .. versionadded:: 3.8