[3.13] gh-122838: Document missing opcodes (GH-123073) (#126492)

gh-122838: Document missing opcodes (GH-123073)
(cherry picked from commit 9cba47d)

Co-authored-by: Kamil Turek <[email protected]>

Author: miss-islington

Doc/library/dis.rst

@@ -1383,6 +1383,13 @@ iterations of the loop.
       This opcode is now only used in situations where the local variable is
       guaranteed to be initialized. It cannot raise :exc:`UnboundLocalError`.
 
+.. opcode:: LOAD_FAST_LOAD_FAST (var_nums)
+
+   Pushes references to ``co_varnames[var_nums >> 4]`` and
+   ``co_varnames[var_nums & 15]`` onto the stack.
+
+   .. versionadded:: 3.13
+
 .. opcode:: LOAD_FAST_CHECK (var_num)
 
    Pushes a reference to the local ``co_varnames[var_num]`` onto the stack,
@@ -1403,6 +1410,20 @@ iterations of the loop.
 
    Stores ``STACK.pop()`` into the local ``co_varnames[var_num]``.
 
+.. opcode:: STORE_FAST_STORE_FAST (var_nums)
+
+   Stores ``STACK[-1]`` into ``co_varnames[var_nums >> 4]``
+   and ``STACK[-2]`` into ``co_varnames[var_nums & 15]``.
+
+   .. versionadded:: 3.13
+
+.. opcode:: STORE_FAST_LOAD_FAST (var_nums)
+
+   Stores ``STACK.pop()`` into the local ``co_varnames[var_nums >> 4]``
+   and pushes a reference to the local ``co_varnames[var_nums & 15]``
+   onto the stack.
+
+   .. versionadded:: 3.13
 
 .. opcode:: DELETE_FAST (var_num)