Update 7-knowledge-check.yml

Author: QijieXue

learn-pr/wwl-language/csharp-basic-formatting/7-knowledge-check.yml

@@ -14,7 +14,7 @@ durationInMinutes: 3
 quiz:
   title: ""
   questions:
-  - content: "Which of the following escape sequences should be used to add double quotes to a literal string in C# code?"
+  - content: "Which of the following escape sequences should be used to add double quotes to a literal string in C# code?" 
     choices:
     - content: "'`\\q`'"
       isCorrect: false
@@ -57,4 +57,4 @@ quiz:
       explanation: "Incorrect. This line escapes the `'` character and results in an error."
     - content: "'`directory = directory + @\"\\\";`'"
       isCorrect: true
-      explanation: "Correct. The `@` symbol creates a verbatim string where it's unnecessary to escape the `\\`."
+      explanation: "Correct. The `@` symbol creates a verbatim string where it's unnecessary to escape the `\\`."