Fix link to user page from API help page

The link to the user page on main API help page [1] has wrong URL [2] and should point to correct user page URL [3].


[1] http://susestudio.com/help/api/index.html
[2] http://susestudio.com/help/api/user/account#/api-hooks
[3] http://susestudio.com/user/account#/api-hooks