add comment for jitsi-meet params

tracim/development.ini.base

 
 ## Jitsi_meet_integration
 jitsi_meet.activated = False
+# Domain/IP where jitsi_meet is located, example: "meet.jit.si", "127.0.0.1"
 jitsi_meet.domain = your_jitsi_meet_instance
+# Choose between token and anonymous auth, anonymous is default one.
+# for token auth config, see : https://github.com/jitsi/lib-jitsi-meet/blob/52eb3decf6542413c739ce2209456fac728a89d5/doc/tokens.md
 jitsi_meet.use_token = False
+# If token mode is choosen, you need to provide a token generator.
+# "local" value mean that tracim himself will create token for jitsi-meet
 jitsi_meet.token_generator = local
+# identifier share between jitsi_meet and local token_generator
 jitsi_meet.token_generator.local.app_id = tracim
+# Secret share between jitsi-meet and local token_generator
 jitsi_meet.token_generator.local.secret = my_secret
+# Algorithm used to sign JWT token
 jitsi_meet.token_generator.local.algo = HS256
-jitsi_meet.token_generator.local.duration = 60
+# Duration of token validity in second. 5 minutes (300) is a good choice.
+jitsi_meet.token_generator.local.duration = 300
 
 ## Radical (CalDav server) configuration
 # radicale.server.host = 0.0.0.0