linux.md: correct URL of ARM deb, add tip on running on 64 bit ARM os.

Author: dkegel-fastly

content/getting-started/install/linux.md

@@ -35,8 +35,8 @@ sudo dpkg -i tinygo_0.23.0_amd64.deb
 If you are on a Raspberry Pi or other ARM-based Linux computer, you should use this command instead:
 
 ```shell
-wget https://github.com/tinygo-org/tinygo/releases/download/v0.23.0/tinygo_0.23.0_arm.deb
-sudo dpkg -i tinygo_0.23.0_arm.deb
+wget https://github.com/tinygo-org/tinygo/releases/download/v0.23.0/tinygo_0.23.0_armhf.deb
+sudo dpkg -i tinygo_0.23.0_armhf.deb
 ```
 
 You will need to ensure that the path to the `tinygo` executable file is in your `PATH` variable.
@@ -52,6 +52,12 @@ $ tinygo version
 tinygo version 0.23.0 linux/amd64 (using go version go1.18.1 and LLVM version 14.0.0)
 ```
 
+If you are on a 64 bit ARM OS, and running tinygo fails with "no such file or directory", you may need to install the 32 bit C++ runtime library, e.g.:
+
+```shell
+sudo apt install libstdc++6:armhf
+```
+
 If you are only interested in compiling TinyGo code for WebAssembly then you are now done with the installation.
 
 Otherwise, please continue with the installation of the additional requirements for your desired microcontroller.