Remove special characters

ch03_opening_and_searching_files.md

@@ -76,12 +76,12 @@ Here are what they mean:
 
 The take-home here is that you can modify your own paths. Let's assume this is your project structure:
 ```
-▾ app/
-  ▸ assets/
-  ▾ controllers/
-      application_controller.rb
-      comments_controller.rb
-      users_controller.rb
+app/
+  - assets/
+  - controllers/
+    - application_controller.rb
+    - comments_controller.rb
+    - users_controller.rb
   ...
 ```
 

ch12_search_and_substitute.md

@@ -645,8 +645,8 @@ small dog
 Assume your directory structure looks like this:
 
 ```
-├── food.txt
-├── animal.txt
+- food.txt
+- animal.txt
 ```
 
 First, capture both `food.txt` and `animal.txt` inside `:args`. Recall from earlier chapters that `:args` can be used to create a list of file names. There are several ways to do this from inside Vim: