fix typo viritualized->virtualized

Author: Izder456

user/installation-guide/getting-started.md

@@ -8,7 +8,7 @@ GhostBSD is available for general use.
 ## System requirements
 
 * 2 GHz dual core Intel/AMD 64-bit processor
-* 4 GiB RAM (system memory for physical and viritualized installs)
+* 4 GiB RAM (system memory for physical and virtualized installs)
 * VGA capable of 1024x768 screen resolution
 * Network connection
 * 15 GiB of storage