Fix spelling error in rigctl.1

doc/man1/rigctl.1

@@ -1099,7 +1099,7 @@ character should not be a part of the input string.
 Send a raw command string to the radio and expect a number of bytes returned.
 .IP
 This is useful for testing and troubleshooting radio commands and responses when
-developing a backend.  If the # of bytes requested is <= the number actually returnead no timeout will occur.
+developing a backend.  If the # of bytes requested is <= the number actually returned no timeout will occur.
 .IP
 The command argument can have no spaces in it.
 For binary protocols enter values as \\0xAA\\0xBB.  Expect a