[Docs] Correct spelling in update-settings.asciidoc (#27808)

Author: sandeepkanabar

docs/reference/cluster/update-settings.asciidoc

@@ -2,7 +2,7 @@
 == Cluster Update Settings
 
 Allows to update cluster wide specific settings. Settings updated can
-either be persistent (applied cross restarts) or transient (will not
+either be persistent (applied across restarts) or transient (will not
 survive a full cluster restart). Here is an example:
 
 [source,js]