Add patterns for AuthentiSign and e-Verify Doc

[peterdj45]

Description

adding additional keywords to suspicious subject and sender display name regex

also adding Open Document and Sign Now as suspicious link display text keywords

Associated samples

• https://platform.sublime.security/messages/4f9e2a88eb4618919d4cf2db5a88d349da05a0dd9872841749c85db94c19d538
• https://platform.sublime.security/messages/4f9e0527b0371b5191899eefb0f0385ba008e7053126abfb724d84c67953b17d
• https://platform.sublime.security/messages/4f9e18d37ac4a5d8641111639d216eb9dc8c2b1015364ba440a21ceae7f43fa1

Associated hunts

• https://platform.sublime.security/messages/hunt?huntId=019a0935-e2a8-7039-9741-77444668c5ec
• https://platform.sublime.security/messages/hunt?huntId=019a4c7a-751c-7abd-a2ff-406a4c213e8d - hunt for phone number in sender display name

[peterdj45]

looks pretty good in test rules:

https://platform.sublime.security/messages/all-matches?attack_surface_reduction=include&days_back=30&flagged_only=true&flagged_rules_ids=%7B%22019a0cf3-4849-7b26-9963-98daae1ea6ab%22%3A%22is%22%2C%2216936d19-7811-4320-86af-2fb8ae43b5d3%22%3A%22isnot%22%7D&page=1&review_status=unreviewed&status=