Documentation/lint: Use Super I/O instead of SuperIO

Change-Id: Idb16092b687ebffb319bc1908f08f350d612d36a
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39451
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/Documentation/superio/nuvoton/nct5539d.md b/Documentation/superio/nuvoton/nct5539d.md
index e91ebc3..009d329 100644
--- a/Documentation/superio/nuvoton/nct5539d.md
+++ b/Documentation/superio/nuvoton/nct5539d.md
@@ -1,9 +1,9 @@
-# NCT5539D SuperIO
+# NCT5539D Super I/O
 
-The SuperIO has the ID `0xd121` and the source can be found in
+The Super I/O has the ID `0xd121` and the source can be found in
 `src/superio/nuvoton/nct5539d/`.
 
 ## For developers
 
-The SuperIO generates ACPI using the
+The Super I/O generates ACPI using the
 [SSDT generator for generic SuperIOs](../common/ssdt.md).
diff --git a/util/lint/spelling.txt b/util/lint/spelling.txt
index 96a689e..3ab42b1 100644
--- a/util/lint/spelling.txt
+++ b/util/lint/spelling.txt
@@ -27,6 +27,7 @@
 FTBS||FTBFS
 POSIX-complient||POSIX-compliant
 READEME||README
+SuperIO||Super I/O
 aaccessibility||accessibility
 aaccession||accession
 abailable||available