Doc: Improve description of GET_LEN opcode (python#114583)

Eclips4 · efimov-mikhail · commit 8e98322de1ac · 2024-10-09T13:08:26.000+03:00
diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst
@@ -969,7 +969,8 @@ iterations of the loop.
 
 .. opcode:: GET_LEN
 
-   Perform ``STACK.append(len(STACK[-1]))``.
+   Perform ``STACK.append(len(STACK[-1]))``. Used in :keyword:`match` statements where
+   comparison with structure of pattern is needed.
 
    .. versionadded:: 3.10
 
