Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: Ia3dd39a0f7aa9e9146c0dc9888160e77d312615c
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f37c155..1893eb4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -89,17 +89,17 @@
 
 # THIS REPOSITORY HAS A DIFFERENT SUBMISSION PROCESS: this is a subtree in
 # @openbmc and is synced by the maintainer using git-subtree. Please submit
-# changes aginst @openbmc.
+# changes against @openbmc.
 @meta-aspeed://*
 
 # THIS REPOSITORY HAS A DIFFERENT SUBMISSION PROCESS: this is a subtree in
 # @openbmc and is synced by the maintainer using git-subtree. Please submit
-# changes aginst @openbmc.
+# changes against @openbmc.
 @meta-openpower://*
 
 # THIS REPOSITORY HAS A DIFFERENT SUBMISSION PROCESS: this is a subtree in
 # @openbmc and is synced by the maintainer using git-subtree. Please submit
-# changes aginst @openbmc.
+# changes against @openbmc.
 @meta-phosphor://*
 
 @obmc-console://*