[docs] Add "Persian" to the list of RTL languages (#20679)

Author: mirismaili

docs/src/pages/guides/right-to-left/right-to-left.md

@@ -1,6 +1,6 @@
 # Right-to-left
 
-<p class="description">To change the direction of Material-UI components you must follow the following steps. UIs for languages that are read from right-to-left (RTL), such as Arabic and Hebrew, should be mirrored.</p>
+<p class="description">Right-to-left languages such as Arabic, Persian or Hebrew are supported. To change the direction of Material-UI components you must follow the following steps.</p>
 
 ## Steps