quectel: Readme update.

Author: NikolaaaN

ports/quectel/README.md

@@ -49,7 +49,7 @@ Enter the following command in the terminal to install `p7zip-full`, `git`, `mak
 ```
 sudo apt install p7zip-full git make python3
 ```
-The sdk tools require a specific version of the libicu library which can be installed with the following commands:
+On Linux the sdk tools require a specific version of the libicu library which can be installed with the following commands:
 ```
 curl -L http://archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu55_55.1-7ubuntu0.5_amd64.deb -o libicu55.deb
 sudo dpkg -i libicu55.deb || true