[docs] update transit limit description in config file

Signed-off-by: R4SAS <r4sas@i2pmail.org>

contrib/i2pd.conf

@@ -237,8 +237,8 @@ verify = true
 # subscriptions = http://reg.i2p/hosts.txt,http://identiguy.i2p/hosts.txt,http://stats.i2p/cgi-bin/newhosts.txt,http://rus.i2p/hosts.txt
 
 [limits]
-## Maximum active transit sessions (default:2500)
-# transittunnels = 2500
+## Maximum active transit sessions (default: 5000)
+# transittunnels = 5000
 ## Limit number of open file descriptors (0 - use system limit)
 # openfiles = 0
 ## Maximum size of corefile in Kb (0 - use system limit)