Update docs

CHANGELOG.asciidoc

@@ -58,6 +58,8 @@ Changed
 - With `new-instance-open-target` set to a tab option, the tab is now opened in
   the most recently focused (instead of the last opened) window. This can be
   configured with the new `new-instance-open-target.window` setting.
+  It can also be set to `last-visible` to show the pages in the most recently
+  visible window.
 - Word hints now are more clever about getting the element text from some elements.
 - Completions for `:help` and `:bind` now also show hidden commands
 - The `:buffer` completion now also filters using the first column (id).

doc/help/settings.asciidoc

@@ -456,6 +456,7 @@ Valid values:
 
  * +last-opened+: Open new tabs in the last opened window.
  * +last-focused+: Open new tabs in the most recently focused window.
+ * +last-visible+: Open new tabs in the most recently visible window.
 
 Default: +pass:[last-focused]+