fix(curriculum): typo in closed captions (#62549)

curriculum/challenges/english/blocks/learn-how-to-describe-places-and-events/66bbacad1dfc231609e3a512.md

@@ -178,7 +178,7 @@ Watch the video.
      "startTime": 56.5,
      "finishTime": 58.2,
      "dialogue": {
-       "text": "Do you want to walk through on setting them up?",
+       "text": "Do you want a walkthrough on setting them up?",
        "align": "right"
      }
    },

curriculum/challenges/english/blocks/learn-how-to-describe-places-and-events/66c629b890ad58208c028aa4.md

@@ -76,7 +76,7 @@ When these words are combined into `walkthrough`, it means a step-by-step explan
       "startTime": 1,
       "finishTime": 2.7,
       "dialogue": {
-        "text": "Do you want to walk through on setting them up?",
+        "text": "Do you want a walkthrough on setting them up?",
         "align": "center"
       }
     },

curriculum/challenges/english/blocks/learn-how-to-describe-places-and-events/66c62a673fe4792335b86db0.md

@@ -92,7 +92,7 @@ Pay attention to how Sarah uses the phrase `Do you want...` to offer help, rathe
       "startTime": 1,
       "finishTime": 2.7,
       "dialogue": {
-        "text": "Do you want to walk through on setting them up?",
+        "text": "Do you want a walkthrough on setting them up?",
         "align": "center"
       }
     },

curriculum/challenges/english/blocks/learn-how-to-describe-places-and-events/66c62b0c65018625985a897d.md

@@ -77,7 +77,7 @@ Look for the options that agrees with the offer and thanks Sarah.
       "startTime": 1,
       "finishTime": 2.7,
       "dialogue": {
-        "text": "Do you want to walk through on setting them up?",
+        "text": "Do you want a walkthrough on setting them up?",
         "align": "center"
       }
     },