Updated Configuration and usage (markdown)

Configuration-and-usage.md

@@ -20,7 +20,7 @@ Worker should have some default configuration which is applied to worker itself
 
 #### Configuration items
 
-If not specified otherwise than its mandatory item! Mandatory items are bold, optional italic.
+Mandatory items are bold, optional italic.
 
 - **worker-id** - unique identification of worker at one server. This id is used by _isolate_ sanbox on linux systems, so make sure to meet isolates requirements (default is number from 1 to 999).
 - **broker-uri** - URI of the broker (hostname, IP address, including port, ...)
@@ -133,6 +133,8 @@ Installation of **broker** program does following step to your computer:
 
 #### Configuration items
 
+Mandatory items are bold, optional italic.
+
 - _clients_ - specifies address and port to bind for clients (eq. frontends)
     - _address_ - hostname or IP address as string (`*` for any)
     - _port_ - desired port