Update cheatsheets

ifconfig

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ifconfig
+
+> Network Interface Configurator.
+> More information: <https://net-tools.sourceforge.io/man/ifconfig.8.html>.
+
+- View network settings of an Ethernet adapter:
+
+`ifconfig eth0`
+
+- Display details of all interfaces, including disabled interfaces:
+
+`ifconfig -a`
+
+- Disable eth0 interface:
+
+`ifconfig eth0 down`
+
+- Enable eth0 interface:
+
+`ifconfig eth0 up`
+
+- Assign IP address to eth0 interface:
+
+`ifconfig eth0 {{ip_address}}`