Fix admin docs

docs/admin/01_config.rst

@@ -29,12 +29,15 @@ A configuration file might look like this::
 
   secret_key = "VerySecretKeyForSessionSecurity"
 
+  [http]
   allowed_hosts = [ "aleksis.myschool.example.com", "localhost" ]
 
+  [database]
   name = "aleksis"
   user = "aleksis"
   password = "SuperSecretPassword"
 
+  [caching]
   memcached = { enabled = true, address = "127.0.0.1" }
 
 The `secret_key` setting above defines a single value. The following `http`

docs/admin/02_ldap.rst

@@ -25,8 +25,10 @@ configuration file. For example, add something like the following to your
 configuration (normally in `/etc/aleksis`; you can either append to an
 existing file or add a new one)::
 
+  [ldap]
   uri = "ldaps://ldap.myschool.edu"
   bind = { dn = "cn=reader,dc=myschool,dc=edu", password = "secret" }
 
+  [ldap.users]
   search = { base = "ou=people,dc=myschool,dc=edu", filter = "(uid=%(user)s)" }
   map = { first_name = "givenName", last_name = "sn", email = "mail" }

docs/admin/03_psql.rst

@@ -32,6 +32,7 @@ Configure AlekSIS to use PostgreSQL
 
 Fill in the configuration under `/etc/aleksis/aleksis.toml` (or a file with any other name in this directory)::
 
+  [database]
   host = "localhost"
   name = "aleksis"
   username = "aleksis"