treewide: Replace Maximumm with Maximum in Kconfig symbol description

Replace Maximumm with Maximum in Kconfig symbol description, fix a typo.
No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Michal Simek <michal.simek@amd.com>
diff --git a/env/Kconfig b/env/Kconfig
index aaf0b1f..4438f0b 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -60,7 +60,7 @@
 	  to store the environment settings.
 
 config ENV_MAX_ENTRIES
-	int "Maximumm number of entries in the environment hashtable"
+	int "Maximum number of entries in the environment hashtable"
 	default 512
 	help
 	  Maximum number of entries in the hash table that is used internally