trivial: fix spelling errors

Found when updating a downstream client.

Change-Id: Ibaa20d883ebfea9410d0252e7a19c7acdb78c907

tools/3D-Reconstruction/MotionEST/Anandan.py

@@ -122,7 +122,7 @@ class Anandan(MotionEST):
           for i, j in {(r, c), (r, c + 1), (r + 1, c), (r + 1, c + 1)}:
             if 0 <= i < last_mvs.shape[0] and 0 <= j < last_mvs.shape[1]:
               init_mvs.append(last_mvs[i, j])
-        #use last matching results as the start postion as current level
+        #use last matching results as the start position as current level
         min_ssd = None
         min_mv = None
         for init_mv in init_mvs:

vp9/encoder/vp9_encoder.c

@@ -7096,7 +7096,7 @@ static void setup_tpl_stats(VP9_COMP *cpi) {
 }
 
 static void init_encode_frame_result(ENCODE_FRAME_RESULT *encode_frame_result) {
-  encode_frame_result->show_idx = -1;  // Actual encoding deosn't happen.
+  encode_frame_result->show_idx = -1;  // Actual encoding doesn't happen.
 }
 
 #if !CONFIG_REALTIME_ONLY