added monospace to import decalaration

src/docs/asciidoc/jme3/advanced/networking.adoc

@@ -170,7 +170,7 @@ a| Server can read an attribute of the HostedConnection.
 
 === Creating Message Types
 
-Each message represents data that you want to transmit between client and server. Common message examples include transformation updates or game actions. For each message type, create a message class that extends com.jme3.network.AbstractMessage. Use the @Serializable annotation from com.jme3.network.serializing.Serializable and create an empty default constructor. Custom constructors, fields, and methods are up to you and depend on the message data that you want to transmit.
+Each message represents data that you want to transmit between client and server. Common message examples include transformation updates or game actions. For each message type, create a message class that extends com.jme3.network.AbstractMessage. Use the @Serializable annotation from `com.jme3.network.serializing.Serializable` and create an empty default constructor. Custom constructors, fields, and methods are up to you and depend on the message data that you want to transmit.
 
 [source,java]
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