docs: add create invite for on-chain groups

apps/docs/docs/tutorials/api-sdk/groups.md

@@ -183,15 +183,36 @@ const invite = await apiSdk.createInvite(groupId, apiKey)
 
 You can wrap the invite code into a custom URL for your app, where it will handle the logic for adding a member to the group by invite code.
 
-Here is an example of the custom URL structure.
+Here is an example of the custom URL structure:
 
 ```
 https://<custom-domain>?inviteCode=<invite-code>
 ```
 
+
+#### Create invite for on-chain groups
+
+You will have to create an associated off-chain group first in order to use the create invite feature for on-chain groups.
+
+```ts
+const apiKey = "your-api-key"
+const groupName = "onchain-group-name"
+const description = `This group is associated to the on-chain group ${groupName}`
+
+const associatedGroup = await apiSdk.createGroup(
+    groupName,
+    description,
+    "on-chain",
+    16,
+    3600
+)
+
+const invite = await apiSdk.createInvite(associatedGroup.id, apiKey)
+```
+
 #### Get invite
 
-Returns a specific invite along with the group details associated with the invite.
+Returns a specific invite along with the group details associated to the invite.
 
 ```ts
 const inviteCode = "INVITECODE"
@@ -206,7 +227,7 @@ Adds a member to a group using an invite code.
 
 ```ts
 const groupId = "your-group-id"
-const apiKey = "member-id-1"
+const memberId = "member-id-1"
 const inviteCode = "INVITECODE"
 
 await apiSdk.addMemberByInviteCode(groupId, memberId, inviteCode)