docs(tiles): a popped-out session frees its place too

The wiki said a session closed in the meantime frees its place for the
ranking. A session popped out into its own window does the same (it is
never tiled while its window owns its PTY size, and since the previous fix
popping it out with the grid open keeps the count, too), so the sentence now
names both.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/wiki/Tile-Grid.md

@@ -137,13 +137,13 @@ removing a tile, changing the count, focusing or zooming a tile), and never sent
 server. However you leave it (the Tiles button, another tab, Home, a link, closing its last
 tile or session), the Tiles button brings it back as it was. A page reload brings it back
 when the grid was open; after you left it, a reload shows the single view and the Tiles
-button still brings the grid back. A session
+button still brings the grid back. A session that was closed or popped out into its own
-that was closed in the meantime frees its place for another one, picked the way a new grid
+window in the meantime frees its place for another one, picked the way a new grid picks
-picks them; the place stays empty only when no other session is left. Right after a page
+them; the place stays empty only when no other session is left. Right after a page reload
-reload the page does not know yet which sessions are waiting for your answer, so that pick
+the page does not know yet which sessions are waiting for your answer, so that pick goes by
-goes by which sessions are working and which you used last. If the window has become too
+which sessions are working and which you used last. If the window has become too small for
-small for all the tiles, the tile you were in fills the grid until the window is wide enough
+all the tiles, the tile you were in fills the grid until the window is wide enough again,
-again, and the rest of the layout is kept.
+and the rest of the layout is kept.
 
 Split shows the same logo, name and model above both of its panes.