[3.14] gh-141004: Document PyRun_InteractiveOneObject (GH-141405) (GH-141485)

gh-141004: Document `PyRun_InteractiveOneObject` (GH-141405)
(cherry picked from commit 26b7df2430)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>

Doc/c-api/veryhigh.rst

@@ -100,6 +100,20 @@ the same library that the Python runtime is using.
       Otherwise, Python may not handle script file with LF line ending correctly.
 
 
+.. c:function:: int PyRun_InteractiveOneObject(FILE *fp, PyObject *filename, PyCompilerFlags *flags)
+
+   Read and execute a single statement from a file associated with an
+   interactive device according to the *flags* argument.  The user will be
+   prompted using ``sys.ps1`` and ``sys.ps2``. *filename* must be a Python
+   :class:`str` object.
+
+   Returns ``0`` when the input was
+   executed successfully, ``-1`` if there was an exception, or an error code
+   from the :file:`errcode.h` include file distributed as part of Python if
+   there was a parse error.  (Note that :file:`errcode.h` is not included by
+   :file:`Python.h`, so must be included specifically if needed.)
+
+
 .. c:function:: int PyRun_InteractiveOne(FILE *fp, const char *filename)
 
    This is a simplified interface to :c:func:`PyRun_InteractiveOneFlags` below,
@@ -108,17 +122,10 @@ the same library that the Python runtime is using.
 
 .. c:function:: int PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)
 
-   Read and execute a single statement from a file associated with an
-   interactive device according to the *flags* argument.  The user will be
-   prompted using ``sys.ps1`` and ``sys.ps2``.  *filename* is decoded from the
+   Similar to :c:func:`PyRun_InteractiveOneObject`, but *filename* is a
+   :c:expr:`const char*`, which is decoded from the
    :term:`filesystem encoding and error handler`.
 
-   Returns ``0`` when the input was
-   executed successfully, ``-1`` if there was an exception, or an error code
-   from the :file:`errcode.h` include file distributed as part of Python if
-   there was a parse error.  (Note that :file:`errcode.h` is not included by
-   :file:`Python.h`, so must be included specifically if needed.)
-
 
 .. c:function:: int PyRun_InteractiveLoop(FILE *fp, const char *filename)