fix(curriculum) replace single-line blocks with multi-line blocks for… (#41526)

* fix(curriculum) replace single-line blocks with multi-line blocks for issue 51418

Data visualization and Coding Interview Prep portions.

* Update execute-a-markov-algorithm.md

Implemented as inline code blocks as discussed

* Adding missed blocks

* Last file added

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.md

@@ -14,7 +14,9 @@ For example, when a user clicks the `Get Message` button, it changes the text of
 
 This works by adding the following code within the click event:
 
-`document.getElementsByClassName('message')[0].textContent="Here is the message";`
+```js
+document.getElementsByClassName('message')[0].textContent="Here is the message";
+```
 
 # --instructions--
 

curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.md

@@ -14,7 +14,9 @@ When you're looping through these objects, you can use this `imageLink` property
 
 Here's the code that does this:
 
-`html += "<img src = '" + val.imageLink + "' " + "alt='" + val.altText + "'>";`
+```js
+html += "<img src = '" + val.imageLink + "' " + "alt='" + val.altText + "'>";
+```
 
 # --instructions--