substring, after Bjolang's rename of substring/cursors

🤖 Generated with [ECA](https://eca.dev)

Co-Authored-By: eca-agent <git@eca.dev>

_01.Language-basics.sz

@@ -1757,7 +1757,7 @@ A cursor is a position in a string. It is as cheap as an int, but it always sits
       (let* ((start (string-cursor-start s))
              (rest (string-cursor-next s start)))
         (string-append (char->string (char-upcase (string-cursor-ref s start)))
-                       (substring/cursors s rest (string-cursor-end s))))))
+                       (substring s rest (string-cursor-end s))))))
 
 (capitalise "ölstuga")   ;; "Ölstuga"
 
@@ -1765,7 +1765,7 @@ A cursor is a position in a string. It is as cheap as an int, but it always sits
 (: first-word (-> string string))
 (defun (first-word s)
   (match (string-index char-whitespace? s)
-    ((Some c) (substring/cursors s (string-cursor-start s) c))
+    ((Some c) (substring s (string-cursor-start s) c))
     (None s)))
 
 (first-word "hello there world")   ;; "hello"