vpn: Document that values in vpn-config-format.txt do not comprise wh…

…itespace

doc/vpn-config-format.txt

@@ -6,26 +6,27 @@ vpnd will be looking for its configuration files at VPN_STORAGEDIR
 which by default points to /var/lib/connman-vpn. Configuration file names
 must not include other characters than letters or numbers and must have
 a .config suffix. Those configuration files are text files with a simple
-format and we typically have one file per provisioned network.
+key-value pair format organized into sections. Values do not comprise leading
+trailing whitespace. We typically have one file per provisioned network.
 
 If the config file is removed, then vpnd tries to remove the
-provisioned service. If individual service entry inside config is removed,
-then the corresponding provisioned service is removed. If service
-entry is changed, then corresponding service is removed and then
-immediately re-provisioned.
+provisioned service. If an individual service entry inside a config is removed,
+then the corresponding provisioned service is removed. If a service
+section is changed, then the corresponding service is removed and immediately
+re-provisioned.
 
 
-Global entry [global]
-=====================
+Global section [global]
+=======================
 
-These files can have an optional global entry describing the actual file.
-The 2 allowed fields for that entry are:
+These files can have an optional global section describing the actual file.
+The two allowed fields for this section are:
 - Name: Name of the network.
 - Description: Description of the network.
 
 
-Provider entry [provider_*]
-===========================
+Provider section [provider_*]
+=============================
 
 Each provisioned provider must start with the [provider_*] tag.
 Replace * with an identifier unique to the config file.