fixed hero mdbook parsing

collections/developers/grid_deployment/grid_deployment_full_vm.md

@@ -72,9 +72,9 @@ We show the steps to prepare the VM to run the network instance.
 If you are deploying on testnet or devnet, simply replace `mainnet` by the proper network in the following lines.
 
 - Set the prerequisites
-```
-apt update && apt install -y git nano ufw
-```
+  ```
+  apt update && apt install -y git nano ufw
+  ```
 - Download the ThreeFold Tech `grid_deployment` repository
   ```
   git clone https://github.com/threefoldtech/grid_deployment
@@ -82,11 +82,11 @@ apt update && apt install -y git nano ufw
   ```
 - Generate a TFChain node key with `subkey`
   - Note: If you deploy the 3 network instances, you can use the same node key for all 3 networks. But it is recommended to use 3 different keys to facilitate management.
-```
-echo .nodekey_mainnet >> .gitignore
-../../apps/subkey generate-node-key > .nodekey_mainnet
-cat .nodekey_mainnet
-```
+  ```
+  echo .nodekey_mainnet >> .gitignore
+  ../../apps/subkey generate-node-key > .nodekey_mainnet
+  cat .nodekey_mainnet
+  ```
 - Create and the set environment variables file
   ```
   cp .secrets.env-example .secrets.env