fix: Improve consistency on CLI help (#4112)

This makes the english consistent on flags, and improves
the contrast for the placeholder color on dark themes.

cli/publickey.go

@@ -18,7 +18,7 @@ func publickey() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:     "publickey",
 		Aliases: []string{"pubkey"},
-		Short:   "Output your public key for Git operations",
+		Short:   "Output your Coder public key used for Git operations",
 		RunE: func(cmd *cobra.Command, args []string) error {
 			client, err := CreateClient(cmd)
 			if err != nil {