tftp: add page (#9956)

* tftp: add page

* Elaborated on tftp client commands

* Change to the mode example

pages/linux/tftp.md

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+# tftp
+
+> Trivial File Transfer Protocol client.
+> More information: <https://manned.org/tftp.1>.
+
+- Connect to a TFTP server specifying its IP address and port:
+
+`tftp {{server_ip}} {{port}}`
+
+- Connect to a TFTP server and execute a TFTP [c]ommand:
+
+`tftp {{server_ip}} -c {{command}}`
+
+- Connect to a TFTP server using IPv6 and force originating port to be in [R]ange:
+
+`tftp {{server_ip}} -6 -R {{port}}:{{port}}`
+
+- Set the transfer mode to binary or ascii through the tftp client:
+
+`mode {{binary|ascii}}`
+
+- Download file from a server through the tftp client:
+
+`get {{file}}`
+
+- Upload file to a server through the tftp client:
+
+`put {{file}}`
+
+- Exit the tftp client:
+
+`quit`