Correct apt-get command (#42641)

Correcting the apt-get command to install the libmsquic package. Previously, this caused a syntax error:

$ sudo apt-get libmsquic
E: Invalid operation libmsquic

The command `install` was missing.

Author: jochenkirstaetter

docs/fundamentals/networking/quic/quic-overview.md

@@ -63,7 +63,7 @@ Here are some examples of using a package manager to install `libmsquic`:
 - **APT**
 
   ```bash
-  sudo apt-get libmsquic 
+  sudo apt-get install libmsquic 
   ```
 
 - **APK**