disk: Correct help for TPL_PARTITIONS

Fix a few typos in this help text. Fix a typo in SPL_PARTITIONS while
we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/disk/Kconfig b/disk/Kconfig
index 81d8867..c9b9dba 100644
--- a/disk/Kconfig
+++ b/disk/Kconfig
@@ -24,7 +24,7 @@
 	select SPL_STRTO
 	help
 	  Enable this for base partition support in SPL. The required
-	  partition table types shold be enabled separately. This add a
+	  partition table types shold be enabled separately. This adds a
 	  small amount of size to SPL, typically 500 bytes.
 
 config TPL_PARTITIONS
@@ -32,9 +32,9 @@
 	select TPL_SPRINTF
 	select TPL_STRTO
 	help
-	  Enable this for base partition support in SPL. The required
-	  partition table types shold be enabled separately. This add a
-	  small amount of size to SPL, typically 500 bytes.
+	  Enable this for base partition support in TPL. The required
+	  partition table types shold be enabled separately. This adds a
+	  small amount of size to TPL, typically 500 bytes.
 
 config MAC_PARTITION
 	bool "Enable Apple's MacOS partition table"