Tweak text to mention release and not build.

Author: Iamrodos

weasyprint/README.md

@@ -30,7 +30,7 @@ Lambda must be configured with these env vars:
     FONTCONFIG_PATH="/opt/fonts"
     XDG_DATA_DIRS="/opt/lib"
 
-Ensure your Lambda instruction set architecture is set to `x86_64`, as `arm64` is not currently supported as a build type.
+If you are using the release zip files ensure your Lambda instruction set architecture is set to `x86_64` and not `arm64`.
 
 ## Docker Lambda