[3.15] gh-142349: Document LazyImportType.resolve() method (GH-156936) (#157296)

Co-authored-by: Victorien <65306057+Viicos@users.noreply.github.com>

Author: miss-islington

Doc/library/types.rst

@@ -354,6 +354,10 @@ Standard names are defined for the following types:
 
    .. seealso:: :pep:`810`
 
+   .. method:: resolve()
+
+      Reify the lazy import and return the "real" object being imported.
+
 
 .. class:: GetSetDescriptorType