message: also update documentation about the CACHE_SIZE change and format table
diff: @@ -21,7 +21,7 @@ Some options are configurable via environments variables (see [Environment Varia
  Environment variables defined in Varnish base image
  | Environment Variable | Default | Description |
  -| --------------------------------- | --------- | ---------------------------------------------- |
  +| ---------------------------- | --------------------- | -------------------------------------------------------------------------------------- |
  | `VARNISH_BACKEND_HOST` | nginx | Default Backend Host |
  | `VARNISH_BACKEND_PORT` | 8080 | Default listening varnish port |
  | `VARNISH_SECRET` | lagoon_default_secret | Varnish secret used to connect to management |
  @@ -31,6 +31,6 @@ Environment variables defined in Varnish base image
  | `HTTP_RESP_SIZE` | 32k | Maximum number of bytes of HTTP backend response we will deal with |
  | `NUKE_LIMIT` | 150 | Maximum number of objects we attempt to nuke in order to make space for a object body. |
  | `CACHE_TYPE` | malloc | Type of varnish cache |
  -| `CACHE_SIZE` | 100M | Cache size |
  +| `CACHE_SIZE` | 500M | Cache size |
  | `LISTEN` | 8080 | Default backend server port |
  | `MANAGEMENT_LISTEN` | 6082 | Default management listening port |
  