Update installation.md - only 32bit RatOS is recommended (#119)

site/docs/installation.md

@@ -19,7 +19,7 @@ Then use [Balena Etcher](https://www.balena.io/etcher/) to write that image to t
 Note: this will destroy all data on the card!
 
 :::info
-For Raspberry Pis with 1gb or less memory, it's recommended to use the 32-bit (`rpi32`) version of the image. 64-bit (`rpi64`) causes too high memory usage in some situations.
+It is recommended to use the 32-bit (`rpi32`) version of the image, 64-bit (`rpi64`) caused too high memory usage in some situations and is no longer provided.
 :::
 
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