Cosmetic: remove trailing whitespace

TUTORIAL.org

@@ -333,7 +333,7 @@ record labels lets Preserves directly express OCaml data.
 #                  @"when hired"
 #                  <Date 2019, 2, 13>>}
 
-#   @"... to this structure, which in binary is 91 as opposed to 127 bytes"  
+#   @"... to this structure, which in binary is 91 as opposed to 127 bytes"
 #   #set{<0 @"employee name"
 #           "Alyssa P. Hacker"
 #           @"employee roles"