Don't use gpg in Debian instruction

TobiX · TobiX · commit 96fe7616482f · 2021-10-25T20:50:11.000+02:00
It's not really necessary, since apt can work with the keyring file
hosted on cli.github.com.
diff --git a/docs/install_linux.md b/docs/install_linux.md
@@ -14,14 +14,12 @@ our release schedule.
 Install:
 
 ```bash
-curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | sudo gpg --dearmor -o /usr/share/keyrings/githubcli-archive-keyring.gpg
+curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | sudo dd of=/usr/share/keyrings/githubcli-archive-keyring.gpg
 echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" | sudo tee /etc/apt/sources.list.d/github-cli.list > /dev/null
 sudo apt update
 sudo apt install gh
 ```
 
-**Note**: If you get the error _"gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory"_, try installing the `dirmngr` package: `sudo apt install dirmngr`.
-
 Upgrade:
 
 ```bash
