(docs): adjusted configuration examples for backlinks buffer (#1610)

- Fixed the original example's extra parenthesis, which broke the alist.
 - Added a second example for configuring the buffer as a side window.

doc/org-roam.org

@@ -519,11 +519,11 @@ the user. The author's recommended configuration is as follows:
 
 #+begin_src emacs-lisp
   (add-to-list 'display-buffer-alist
-               '(("\\*org-roam\\*"
+               '("\\*org-roam\\*"
                  (display-buffer-in-direction)
                  (direction . right)
                  (window-width . 0.33)
-                  (window-height . fit-window-to-buffer))))
+                 (window-height . fit-window-to-buffer)))
 #+end_src
 
 Crucially, the window is a regular window (not a side-window), and this allows
@@ -533,6 +533,20 @@ for predictable navigation:
   Org-roam buffer.
 - ~C-u RET~ navigates to thing-at-point in the other window.
 
+For users that prefer using a side-window for the org-roam buffer, the following
+example configuration should provide a good starting point:
+
+#+begin_src emacs-lisp
+  (add-to-list 'display-buffer-alist
+               '("\\*org-roam\\*"
+                 (display-buffer-in-side-window)
+                 (side . right)
+                 (slot . 0)
+                 (window-width . 0.33)
+                 (window-parameters . ((no-other-window . t)
+                                       (no-delete-other-windows . t)))))
+#+end_src
+
 ** TODO Styling the Org-roam buffer
 * Node Properties
 ** Standard Org properties

doc/org-roam.texi

@@ -818,11 +818,11 @@ the user. The author's recommended configuration is as follows:
 
 @lisp
 (add-to-list 'display-buffer-alist
-             '(("\\*org-roam\\*"
+             '("\\*org-roam\\*"
                (display-buffer-in-direction)
                (direction . right)
                (window-width . 0.33)
-                (window-height . fit-window-to-buffer))))
+               (window-height . fit-window-to-buffer)))
 @end lisp
 
 Crucially, the window is a regular window (not a side-window), and this allows
@@ -837,6 +837,20 @@ Org-roam buffer.
 @code{C-u RET} navigates to thing-at-point in the other window.
 @end itemize
 
+For users that prefer using a side-window for the org-roam buffer, the following
+example configuration should provide a good starting point:
+
+@lisp
+  (add-to-list 'display-buffer-alist
+               '("\\*org-roam\\*"
+                 (display-buffer-in-side-window)
+                 (side . right)
+                 (slot . 0)
+                 (window-width . 0.33)
+                 (window-parameters . ((no-other-window . t)
+                                       (no-delete-other-windows . t)))))
+@end lisp
+
 @node Styling the Org-roam buffer
 @section @strong{TODO} Styling the Org-roam buffer