RPI: Add a note for ARM64 devices (#161)

Author: andywolk

docs/FreeSWITCH-Explained/Installation/Raspberry-Pi/index.mdx

@@ -5,7 +5,11 @@
 
 ## About
 
-There is no big difference in how to install, build or run FreeSWITCH™ on a Raspberry PI except that we have a special Debian repo for that.
+There is no big difference in how to install, build or run FreeSWITCH™ on a Raspberry PI (armhf) except that we have a special Debian repo for that.
+
+## Note for ARM 64 bit devices
+
+This instruction is for Raspberry Pi 32 bit version (armhf) only! If your device is 64bit (for example Raspberry Pi 5) please use standard [Debian instruction](https://developer.signalwire.com/freeswitch/FreeSWITCH-Explained/Installation/Linux/Debian_67240088)
 
 ## Introduction