docs: improve a comment about rebinding <Backspace>

And move it up, to give the now-final comment a bit more prominence.

doc/sample.nanorc.in

@@ -255,14 +255,18 @@
 ## ".nanorc" extension) should be the same as the "short description"
 ## name inside that file.  These names are kept fairly short to make
 ## them easier to remember and faster to type using nano's -Y option.
-##
+
 ## To include all existing syntax definitions, you can do:
 # include "@PKGDATADIR@/*.nanorc"
 
 
 ## Key bindings.
 ## See nanorc(5) (section REBINDING KEYS) for more details on this.
-##
+
+## If your Backspace key behaves as Delete (when ssh'ing in from another
+## machine, for example), set this to make it behave as Backspace again:
+# bind Del backspace all
+
 ## The <Ctrl+Delete> keystroke deletes the word to the right of the cursor.
 ## On some terminals the <Ctrl+Backspace> keystroke produces ^H, which is
 ## the ASCII character for backspace, so it is bound by default to the
@@ -271,6 +275,3 @@
 ## normally use <Backspace> for backspacing and not ^H, you can make
 ## <Ctrl+Backspace> delete the word to the left of the cursor with:
 # bind ^H cutwordleft main
-
-## Set this if your Backspace key sends Del most of the time.
-# bind Del backspace all