Doc: add missing manpage and title references in tkinter docs (python#29008)

- add bind(3tk) manpage markup
- add Tcl/Tk book reference markup

Author: rffontenelle

Doc/library/tkinter.rst

@@ -877,8 +877,9 @@ of the bind method is::
 where:
 
 sequence
-   is a string that denotes the target kind of event.  (See the bind man page and
-   page 201 of John Ousterhout's book for details).
+   is a string that denotes the target kind of event.  (See the
+   :manpage:`bind(3tk)` man page, and page 201 of John Ousterhout's book,
+   :title-reference:`Tcl and the Tk Toolkit (2nd edition)`, for details).
 
 func
    is a Python function, taking one argument, to be invoked when the event occurs.