Update docs/upgrade.md

Co-authored-by: Francesco Giudici <francesco.giudici@suse.com>
Signed-off-by: Itxaka <igarcia@suse.com>

docs/upgrade.md

@@ -9,7 +9,7 @@ Elemental Teal is upgraded with the Elemental operator. Refer to the
 [Elemental Operator](https://github.com/rancher/elemental-operator/blob/main/README.md) documentation for complete information.
 
 There are two ways of selecting nodes for upgrading. Via a cluster target, which will match ALL nodes in a cluster that matches our
-selector or via node selector, which will match nodes based on the node labels. Node selecter allows us to be more targeted with the upgrade
+selector or via node selector, which will match nodes based on the node labels. Node selector allows us to be more targeted with the upgrade
 while cluster selector just selects all the nodes in a matched cluster.
 
 === "With `#!yaml clusterTarget`"