zshrc: remove SSH_KEY_PATH comment

Fixes #5741

templates/zshrc.zsh-template

@@ -83,9 +83,6 @@ source $ZSH/oh-my-zsh.sh
 # Compilation flags
 # export ARCHFLAGS="-arch x86_64"
 
-# ssh
-# export SSH_KEY_PATH="~/.ssh/rsa_id"
-
 # Set personal aliases, overriding those provided by oh-my-zsh libs,
 # plugins, and themes. Aliases can be placed here, though oh-my-zsh
 # users are encouraged to define aliases within the ZSH_CUSTOM folder.