Update one-time-passcode.md

Author: csmulligan

articles/active-directory/external-identities/one-time-passcode.md

@@ -62,7 +62,7 @@ When a guest user redeems an invitation or uses a link to a resource that has be
 - They don't have an Azure AD account.
 - They don't have a Microsoft account.
 - The inviting tenant didn't set up federation with social (like [Google](google-federation.md)) or other identity providers.
-- They don't have any other authetication method, any password-backed accounts.
+- They don't have any other authentication method or any password-backed accounts.
 - Email one-time passcode is enabled.
 
 At the time of invitation, there's no indication that the user you're inviting will use one-time passcode authentication. But when the guest user signs in, one-time passcode authentication will be the fallback method if no other authentication methods can be used.