Doc: Fix missing semicolons

Thanks to Marco Gartmann for the bugreport.

doc/bird.sgml

@@ -3393,18 +3393,18 @@ protocol ospf [v2|v3] <name> {
                 networks {
 			<prefix>;
 			<prefix> hidden;
-		}
+		};
                 external {
 			<prefix>;
 			<prefix> hidden;
 			<prefix> tag <num>;
-		}
+		};
 		stubnet <prefix>;
 		stubnet <prefix> {
 			hidden <switch>;
 			summary <switch>;
 			cost <num>;
-		}
+		};
 		interface <interface pattern> [instance <num>] {
 			cost <num>;
 			stub <switch>;
@@ -3929,7 +3929,7 @@ protocol ospf MyOSPF {
 		networks {
 			172.16.1.0/24;
 			172.16.2.0/24 hidden;
-		}
+		};
 		interface "-arc0" , "arc*" {
 			type nonbroadcast;
 			authentication none;
@@ -5151,12 +5151,12 @@ protocol static {
 	route 10.2.0.0/24 via "arc0";	# Secondary network
 	route 192.168.10.0/24 via 198.51.100.100 {
 		ospf_metric1 = 20;	# Set extended attribute
-	}
+	};
 	route 192.168.10.0/24 via 198.51.100.100 {
 		ospf_metric2 = 100;	# Set extended attribute
 		ospf_tag = 2;		# Set extended attribute
 		bfd;			# BFD-controlled route
-	}
+	};
 }
 </code>