Merge r4238: Document max_connections somewhat

git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@4316 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/shmlog_tags.h

@@ -56,6 +56,8 @@ SLTM(ClientAddr)
 SLTM(Backend)
 SLTM(Length)
 
+SLTM(FetchError)
+
 SLTM(RxRequest)
 SLTM(RxResponse)
 SLTM(RxStatus)

man/vcl.7so

@@ -93,6 +93,11 @@ if (req.http.host ~ "^(www\.)?example.com$") {
 }
 .Ed
 .Pp
+To avoid overloading backend servers,
+.Fa .max_connections
+can be set to limit the maximum number of concurrent backend connections.
+.Ed
+.Pp
 The timeout parameters can be overridden in the backend declaration.
 The timeout parameters are
 .Fa .connect_timeout