[3.13] InternalDocs: Correct struct path for latin1 singletons in string_interning.md (GH-148358) (#148491)

(cherry picked from commit 0274d83)

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: miss-islington

InternalDocs/string_interning.md

@@ -15,8 +15,8 @@ dynamic interning.
 
 The 256 possible one-character latin-1 strings, which can be retrieved with
 `_Py_LATIN1_CHR(c)`, are stored in statically allocated arrays,
-`_PyRuntime.static_objects.strings.ascii` and
-`_PyRuntime.static_objects.strings.latin1`.
+`_PyRuntime.static_objects.singletons.strings.ascii` and
+`_PyRuntime.static_objects.singletons.strings.latin1`.
 
 Longer singleton strings are marked in C source with `_Py_ID` (if the string
 is a valid C identifier fragment) or `_Py_STR` (if it needs a separate