buildman: Fix a few typos in toolchain code

Fix 'Thie' and capitalise 'unicode'.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
index 79c7c11..324ad0e 100644
--- a/tools/buildman/toolchain.py
+++ b/tools/buildman/toolchain.py
@@ -175,9 +175,9 @@
     def MakeEnvironment(self, full_path):
         """Returns an environment for using the toolchain.
 
-        Thie takes the current environment and adds CROSS_COMPILE so that
+        This takes the current environment and adds CROSS_COMPILE so that
         the tool chain will operate correctly. This also disables localized
-        output and possibly unicode encoded output of all build tools by
+        output and possibly Unicode encoded output of all build tools by
         adding LC_ALL=C.
 
         Note that os.environb is used to obtain the environment, since in some