Update cheatsheets

arp

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# arp
+
+> Show and manipulate your system's ARP cache.
+> More information: <https://manned.org/arp>.
+
+- Show the current ARP table:
+
+`arp -a`
+
+- [d]elete a specific entry:
+
+`arp -d {{address}}`
+
+- [s]et up a new entry in the ARP table:
+
+`arp -s {{address}} {{mac_address}}`