Fix spelling typo in security FAQ.

Change-Id: Ic585f97d93ca9bd87bd861155ed80b33e8950985
Reviewed-on: https://chromium-review.googlesource.com/881464
Reviewed-by: Chris Palmer <[email protected]>
Commit-Queue: Eric Roman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#531304}
diff --git a/docs/security/faq.md b/docs/security/faq.md
index 3d4ab3f..11178201 100644
--- a/docs/security/faq.md
+++ b/docs/security/faq.md
@@ -434,10 +434,10 @@
 Features](https://www.chromium.org/Home/chromium-security/prefer-secure-origins-for-powerful-new-features).
 In short, many web platform features give web origins access to sensitive new
 sources of information, or significant power over a user's experience with their
-computer/phone/watch/et c., or over their experience with it. We would therefore
+computer/phone/watch/etc., or over their experience with it. We would therefore
 like to have some basis to believe the origin meets a minimum bar for security,
 that the sensitive information is transported over the Internet in an
-authetnicated and confidential way, and that users can make meaningful choices
+authenticated and confidential way, and that users can make meaningful choices
 to trust or not trust a web origin.
 
 Note that the reason we require secure origins for WebCrypto is slightly