Fix typo in GitLab Notification Email doc

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

doc/user/profile/notifications.md

@@ -144,7 +144,7 @@ Users will be notified of the following events:
 | New email added              | User                | Security email, always sent. |
 | Email changed                | User                | Security email, always sent. |
 | Password changed             | User                | Security email, always sent when user changes their own password |
-| Password changed by administrator | User | Security email, always sent when an adminstrator changes the password of another user |
+| Password changed by administrator | User | Security email, always sent when an administrator changes the password of another user |
 | Two-factor authentication disabled | User          | Security email, always sent. |
 | New user created             | User                | Sent on user creation, except for OmniAuth (LDAP)|
 | User added to project        | User                | Sent when user is added to project |