Update Seeder's Guide on policy — radicle.xyz

With radicle 1.1.0-rc.11, the policy configuration was changed, and this guide needs a corresponding update.

   "node": {
     "alias": "seed.radicle.example",
     "externalAddresses": ["seed.radicle.example:8776"],
     "policy": "allow",
     "scope": "all"
     "seedingPolicy": {
       "default": "allow",
       "scope": "all"
     }
   }
 }
 ```

 replicates on the network when it encounters a repository it doesn't know or
 hasn't been given special instructions for.
 The setting is configured under the `node.policy` field in your configuration
 (`~/.radicle/config.json`). You can open your configuration file directly
 using the `rad config edit` command, or use your preferred editor. You can
 also enter the following command to display your current default policy:
 The setting is configured under the `node.seedingPolicy` field in your
 configuration (`~/.radicle/config.json`). You can open your configuration file
 directly using the `rad config edit` command, or use your preferred editor. You
 can also enter the following command to display your current default policy:
     rad config get node.policy
     rad config get node.seedingPolicy
 When a seeding policy is *not set* for a specific repository or node, the
 default policy is applied, hence the importance of this setting.

 This is a good default for seeders who want to support the network without
 having to think about it too much.
 Set `node.policy` to `allow` to configure your node this way.
 Set `node.seedingPolicy.default` to `allow` and `node.seedingPolicy.scope` to
 `all` to configure your node this way.
 ```json
 {
   "node": {
     ...
     "policy": "allow",
     "scope": "all"
     "seedingPolicy": {
       "default": "allow",
       "scope": "all"
     }
   }
 }
 ```

 want to limit the data hosted by their seed, or node operators who want
 to require some form of authentication or payment for seeding.
 Set `node.policy` to `block` to enable this, and call `rad seed` to configure
 `allow` policies for specific repositories you want to seed. Your seed node
 won't seed anything until you explicitly allow it to.
 Set `node.seedingPolicy.default` to `block` to enable this, and call `rad seed`
 to configure  `allow` policies for specific repositories you want to seed. Your
 seed node won't seed anything until you explicitly allow it to.
 ```json
 {
   "node": {
     ...
     "policy": "block",
     "scope": "all"
     "seedingPolicy": {
       "default": "allow"
     }
   }
 }
 ```

 #### Viewing policies
 You can view your node's *default* by entering `rad config get node.policy`.
 You can view your node's *default* by entering `rad config get node.seedingPolicy`.
 To view the policy of a specific repository, use the `rad inspect` command. For
 example: