[DATALAD RUNCMD] chore: run codespell throughout fixing a few typos interactively

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "codespell -w -i 3 -C 4",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

Author: yarikoptic

docs/pose_tracking_gui_tutorial.rst

@@ -17,7 +17,7 @@ Follow the steps below to generate keypoints for your videos:
    -  For processing single video, select ``Load video``. Alternatively,
       for processing multiple videos, select ``Load multiple videos`` to
       select the folder containing the videos. (Note: Pose estimation
-      for multipl videos is only supported for videos recorded
+      for multiple videos is only supported for videos recorded
       simultaneously i.e. have the same time duration and frame rate).
 
    (Optional) Set output folder