PyAPI Doc: fix typos causing untyped parameters

The type for `bpy_struct.keyframe_insert()`'s `options` parameter was
instead applied to a non-existent `flag` parameter.

The description and type for `mathutils.Vector.Repeat()`'s `vector`
parameter was instead applied to a non-existent `tuple` parameter.

Also fix a reference to `BMElemeSeq` instead of `BMElemSeq`.

Ref: !122734

source/blender/python/bmesh/bmesh_py_types.cc

@@ -2912,7 +2912,7 @@ PyDoc_STRVAR(
     ".. method:: sort(key=None, reverse=False)\n"
     "\n"
     "   Sort the elements of this sequence, using an optional custom sort key.\n"
-    "   Indices of elements are not changed, BMElemeSeq.index_update() can be used for that.\n"
+    "   Indices of elements are not changed, :class:`BMElemSeq.index_update` can be used for that.\n"
     "\n"
     "   :arg key: The key that sets the ordering of the elements.\n"
     "   :type key: :function: returning a number\n"

source/blender/python/intern/bpy_rna_anim.cc

@@ -319,7 +319,7 @@ char pyrna_struct_keyframe_insert_doc[] =
     "      - ``INSERTKEY_AVAILABLE`` Only insert into already existing F-Curves.\n"
     "      - ``INSERTKEY_CYCLE_AWARE`` Take cyclic extrapolation into account "
     "(Cycle-Aware Keying option).\n"
-    "   :type flag: set\n"
+    "   :type options: set\n"
     "   :arg keytype: Type of the key: 'KEYFRAME', 'BREAKDOWN', 'MOVING_HOLD', 'EXTREME', "
     "'JITTER', or 'GENERATED'\n"
     "   :type keytype: string\n"

source/blender/python/mathutils/mathutils_Vector.cc

@@ -354,8 +354,8 @@ PyDoc_STRVAR(
     "\n"
     "   Create a vector by repeating the values in vector until the required size is reached.\n"
     "\n"
-    "   :arg tuple: The vector to draw values from.\n"
-    "   :type tuple: :class:`mathutils.Vector`\n"
+    "   :arg vector: The vector to draw values from.\n"
+    "   :type vector: :class:`mathutils.Vector`\n"
     "   :arg size: The size of the vector to be created.\n"
     "   :type size: int\n");
 static PyObject *C_Vector_Repeat(PyObject *cls, PyObject *args)