Update cheatsheets

tldr/linux/ip-maddress

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ip maddress
+
+> Manage multicast addresses.
+> More information: <https://manned.org/ip-maddress>.
+
+- List multicast addresses and how many programs are subscribed to them:
+
+`ip maddress`
+
+- List device specific addresses:
+
+`ip maddress show dev {{eth0}}`
+
+- Join a multicast group statically:
+
+`sudo ip maddress add {{33:33:00:00:00:02}} dev {{eth0}}`
+
+- Leave a static multicast group:
+
+`sudo ip maddress delete {{33:33:00:00:00:02}} dev {{eth0}}`