Update instructions for signing Carta Manifiesto

Clarified instructions for signing the Carta Manifiesto and provided the URL for the public portal.

Author: edgtz

website/i18n/en/docusaurus-plugin-content-docs/current/getting-started/organization-onboarding.mdx

@@ -36,10 +36,10 @@ This step is part of the base setup required to operate in production.
 
 ### 5. Sign Carta Manifiesto (SAT Requirement)
 
-<!-- In `Settings > Sign Carta Manifiesto`, sign the letter to comply with the current RMF.
-If you are an integrator with multiple issuing organizations, you can share the URL of our public portal to sign the Carta Manifiesto. -->
+In `Settings > Sign Carta Manifiesto`, sign the letter to comply with the current RMF.
 
-At https://www.facturapi.io/manifiesto sign the letter to comply with the current RMF.
+If you are an integrator with multiple issuing organizations, you can share the URL of our public portal to sign the Carta Manifiesto:
+https://www.facturapi.io/manifiesto
 
 This step uses the e.firma (FIEL) of the issuing RFC. To complete the signature, you must provide: