telnet: improve descriptions (#1353)
telnet: improve descriptions (#1353)

* telnet: improve descriptions

also format "x" as a token in the last example.

* telnet: update per code review

deekim/tldr,felixonmars/tldr,cptdeka10/tldr,katekyan/tldr,UncommonPleb/tldr,zoisom/tldr,felixonmars/tldr,Phizho/tldr,UncommonPleb/tldr,katekyan/tldr,deekim/tldr,zoisom/tldr,cptdeka10/tldr,Phizho/tldr,deekim/tldr,slash3b/tldr,slash3b/tldr,UncommonPleb/tldr,cptdeka10/tldr,katekyan/tldr,zoisom/tldr,felixonmars/tldr,Phizho/tldr,slash3b/tldr