Fixed one example page

(cherry picked from commit d906eb4f55395db2270a72d7fceba18f36da9b0f)
Fixed file example page

(cherry picked from commit 00ab622a2e30197a84def60936be1b0c58c1dcce)
guide/faq.markdown: add information about changing policy server IP

(cherry picked from commit 3694fda0bfd151e2c6e6a884cd2560348713337b)
Removed a mention of MongoDB

(cherry picked from commit 447437a0132cf07819ff67f0e13f12979dfd1856)
Added known issue about LDAP integration and mision portal slowness

(cherry picked from commit af2fc882f0b5b3a75cf6068ecb384fdfd58021fd)