Add a note about retty as root attaching process running as regular user
treea170848966716dbee469ff6d0714025f8afe23dd
-rw-r--r-- 24 .gitignore
-rw-r--r-- 18009 COPYING
-rw-r--r-- 645 Makefile
-rw-r--r-- 450 README
drwxr-xr-x - arch
-rw-r--r-- 1194 blindtty.c
-rwxr-xr-x 897 bytecode.pl
-rwxr-xr-x 620 getarch.sh
-rw-r--r-- 3246 retty.1
-rw-r--r-- 11391 retty.c