chore: fix a typo

apps/docs/content/guides/self-hosting/self-hosted-oauth.mdx

@@ -192,7 +192,7 @@ GOTRUE_EXTERNAL_GITHUB_REDIRECT_URI: ${API_EXTERNAL_URL}/auth/v1/callback
 6. Click **Register**
 7. Copy the **Application (client) ID**
 8. Click on **Client credentials** > **Add a certificate or secret**
-9. Click on **New client secrete** and add a client secret
+9. Click on **New client secret** and add a client secret
 10. Copy the secret value (not "secret ID")
 
 **`.env`:**