test: update yq docs

Adds examples of disabled YQ dialect operators in limactl create --help.

Author: Mysterio-17

cmd/limactl/start.go

@@ -58,6 +58,10 @@ func newCreateCommand() *cobra.Command {
   To create an instance "default" with yq expressions:
   $ limactl create --set='.cpus = 2 | .memory = "2GiB"'
 
+  Lima's YQ dialect disables environment variable access and file load operations for security reasons.
+  For example, the following yq operators are NOT supported: env, load, load_str.
+  For more details, see 'limactl help yq-dialect'.
+
   To create an instance "default" with a template parameter:
   $ limactl create --name=default --param containerdSnapshotter=false template:docker