tweaks: swap and reword two bullet points in the rnano manpage

doc/rnano.1

@@ -34,9 +34,9 @@ In restricted mode, \fBnano\fR will:
 .IP \[bu] 2
 not allow suspending;
 .IP \[bu]
-not read nor write any file not specified on the command line;
+not allow saving the current buffer under a different name;
 .IP \[bu]
-not allow saving a file under a different name;
+not allow inserting another file or opening a new buffer;
 .IP \[bu]
 not allow appending or prepending to any file;
 .IP \[bu]