Update content/applications/sales/rental/service_products.rst

Co-authored-by: Jess Rogers <104637850+jero-odoo@users.noreply.github.com>

Author: meval1006

content/applications/sales/rental/service_products.rst

@@ -229,7 +229,7 @@ process.
 A link to the signature request will appear in the chatter of the rental order. The document is
 accessible to the customer via the customer portal or email.
 
-Signing a document from a email link
+Signing a document from an email link
 ------------------------------------
 
 When a customer clicks :guilabel:`Sign document`, a separate page is then revealed, showcasing the