[3.14] Fix a typo in STORE_SLICE docs (GH-143500) (#143533)

Fix a typo in STORE_SLICE docs (GH-143500)
(cherry picked from commit 228d955)

Co-authored-by: Tomas R <tomas.roun8@gmail.com>

Author: miss-islington

Doc/library/dis.rst

@@ -768,7 +768,7 @@ not have to be) the original ``STACK[-2]``.
       end = STACK.pop()
       start = STACK.pop()
       container = STACK.pop()
-      values = STACK.pop()
+      value = STACK.pop()
       container[start:end] = value
 
    .. versionadded:: 3.12