[doc] Minor improvements to is_typeddict (GH-22280)

1. The check is on the type
2. Add link to TypeDict

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index bfff81e26760f520ef3674046aa5b012af0ffe28..d31c65d38e1abbbf07c004549db787923f0402d9 100644 (file)
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -1660,7 +1660,7 @@ Introspection helpers
 
 .. function:: is_typeddict(tp)
 
-   Check if an annotation is a TypedDict class.
+   Check if a type is a :class:`TypedDict`.
 
    For example::
         class Film(TypedDict):