docs: update rnano manpage, as -R/--restricted now reads nanorc

This fixes https://savannah.gnu.org/bugs/?54770.

doc/rnano.1

@@ -32,8 +32,6 @@ access to the filesystem nor to a command shell.
 .PP
 In restricted mode, \fBnano\fR will:
 .IP \[bu] 2
-not read any nanorc files;
-.IP \[bu]
 not allow suspending;
 .IP \[bu]
 not read nor write any file not specified on the command line;