Make 1Password linked-item example generic (#440)

Replace the specific service name in the "sign in with" example with a
generic description of a linked-item reference.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: masnwilliams

integrations/1password.mdx

@@ -141,10 +141,10 @@ If your 1Password item has a one-time password (TOTP) field configured, it will
 
 ## Supported Login Types
 
-Managed Auth fills **direct logins** from 1Password items: username/password credentials plus any TOTP field for 2FA. This includes signing directly into an identity provider itself—for example logging into a Google or Gmail account with its stored username, password, and TOTP.
+Managed Auth fills **direct logins** from 1Password items: username/password credentials plus any TOTP field for 2FA. This includes signing directly into an identity provider itself—for example logging into a Google account with its stored username, password, and TOTP.
 
 <Warning>
-1Password's linked-item "sign in with" references are not supported. When an item delegates authentication to a separate item—for example a PostHog item set to **sign in with Google**—that link is not exposed through the 1Password API, so Managed Auth can't follow it to the underlying credential. Store a direct login (username/password, plus a TOTP field if needed) for the target site instead.
+1Password's linked-item "sign in with" references are not supported. When an item delegates authentication to a separate item—for example a site item set to **sign in with** another login—that link is not exposed through the 1Password API, so Managed Auth can't follow it to the underlying credential. Store a direct login (username/password, plus a TOTP field if needed) for the target site instead.
 </Warning>
 
 ## Credential Options