patman: fix some typos in comments

s/Subprocress/Subprocess/
s/easiler/easier/
s/repositiory/repository/
s/rangem/range/
s/Retruns/Returns/

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/terminal.py b/tools/patman/terminal.py
index 4ceab18..7a3b658 100644
--- a/tools/patman/terminal.py
+++ b/tools/patman/terminal.py
@@ -128,7 +128,7 @@
         return ''
 
     def Stop(self):
-        """Retruns a stop color code.
+        """Returns a stop color code.
 
         Returns:
           If color is enabled, returns an ANSI color reset sequence,