scripts: add volatge to spelling.txt

To avoid future misspells add volatge to spelling.txt.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/scripts/spelling.txt b/scripts/spelling.txt
index 17fdc62..aec616b 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -1584,6 +1584,7 @@
 virtiual||virtual
 visiters||visitors
 vitual||virtual
+volatge||voltage
 vunerable||vulnerable
 wakeus||wakeups
 wathdog||watchdog