gh-100616: Document 'attr' parameter for window.vline() in curses module (#24961)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>

Author: mathieui

Doc/library/curses.rst

@@ -1297,11 +1297,11 @@ the following methods and attributes:
  :meth:`refresh`.
 
 
-.. method:: window.vline(ch, n)
- window.vline(y, x, ch, n)
+.. method:: window.vline(ch, n[, attr])
+ window.vline(y, x, ch, n[, attr])
 
  Display a vertical line starting at ``(y, x)`` with length *n* consisting of the
- character *ch*.
+ character *ch* with attributes *attr*.
 
 
 Constants

Misc/NEWS.d/next/Documentation/2022-12-30-00-42-23.gh-issue-100616.eu80ij.rst

@@ -0,0 +1,2 @@
+Document existing ``attr`` parameter to :func:`curses.window.vline` function
+in :mod:`curses`.