docs: gluon-mesh-batman-adv: note regarding IGMP/MLD snooping switches
This adds a warning that entprise switches with an IGMP/MLD snooping feature are not supported yet with IGMP/MLD filtering enabled. For this to work, firstly the Linux bridge on the Gluon node needs to support Multicast Router Discovery (RFC4286). But this feature was only added to the Linux kernel recently, in 5.1. Secondly, a Gluon node would need to periodically send "Multicast Router Advertisment" (RFC4286) messages, to "announce" the multicast router port setting on bridge port bat0. Thirdly, the IGMP/MLD snooping switches would need to implement RFC4286.
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