docs: explain what it means when --rawsequences is needed

doc/nano.1

@@ -140,10 +140,12 @@ text.  (The color of the stripe can be changed with \fBset stripecolor\fR
 in your \fInanorc\fR file.)
 .TP
 .BR \-K ", " \-\-rawsequences
-Interpret escape sequences directly (instead of asking \fBncurses\fR to
-translate them).  If you need this option to get your keyboard to work
-properly, please report a bug.  Using this option disables \fBnano\fR's
-mouse support.
+Interpret escape sequences directly, instead of asking \fBncurses\fR
+to translate them.  (If you need this option to get some keys to work
+properly, it means that the terminfo terminal description that is used
+does not fully match the actual behavior of your terminal.  This can
+happen when you ssh into a BSD machine, for example.)
+Using this option disables \fBnano\fR's mouse support.
 .TP
 .BR \-L ", " \-\-nonewlines
 Don't automatically add a newline when a text does not end with one.

doc/nano.texi

@@ -425,10 +425,12 @@ in your nanorc file.)
 
 @item -K
 @itemx --rawsequences
-Interpret escape sequences directly (instead of asking @code{ncurses} to
-translate them).  If you need this option to get your keyboard to work
-properly, please report a bug.  Using this option disables @command{nano}'s
-mouse support.
+Interpret escape sequences directly, instead of asking @code{ncurses}
+to translate them.  (If you need this option to get some keys to work
+properly, it means that the terminfo terminal description that is used
+does not fully match the actual behavior of your terminal.  This can
+happen when you ssh into a BSD machine, for example.)
+Using this option disables @command{nano}'s mouse support.
 
 @item -L
 @itemx --nonewlines
@@ -1053,10 +1055,12 @@ This makes it possible to rejustify blocks of quoted text when composing
 email, and to rewrap blocks of line comments when writing source code.
 
 @item set rawsequences
-Interpret escape sequences directly (instead of asking @code{ncurses} to
-translate them).  If you need this option to get your keyboard to work
-properly, please report a bug.  Using this option disables @command{nano}'s
-mouse support.
+Interpret escape sequences directly, instead of asking @code{ncurses}
+to translate them.  (If you need this option to get some keys to work
+properly, it means that the terminfo terminal description that is used
+does not fully match the actual behavior of your terminal.  This can
+happen when you ssh into a BSD machine, for example.)
+Using this option disables @command{nano}'s mouse support.
 
 @item set rebinddelete
 Interpret the @kbd{Delete} and @kbd{Backspace} keys differently so that

doc/nanorc.5

@@ -271,10 +271,12 @@ This makes it possible to rejustify blocks of quoted text when composing
 email, and to rewrap blocks of line comments when writing source code.
 .TP
 .B set rawsequences
-Interpret escape sequences directly (instead of asking \fBncurses\fR to
-translate them).  If you need this option to get your keyboard to work
-properly, please report a bug.  Using this option disables \fBnano\fR's
-mouse support.
+Interpret escape sequences directly, instead of asking \fBncurses\fR
+to translate them.  (If you need this option to get some keys to work
+properly, it means that the terminfo terminal description that is used
+does not fully match the actual behavior of your terminal.  This can
+happen when you ssh into a BSD machine, for example.)
+Using this option disables \fBnano\fR's mouse support.
 .TP
 .B set rebinddelete
 Interpret the Delete and Backspace keys differently so that both Backspace