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/cros_subprocess.py b/tools/patman/cros_subprocess.py
index 0f0d60d..efd0a5a 100644
--- a/tools/patman/cros_subprocess.py
+++ b/tools/patman/cros_subprocess.py
@@ -6,11 +6,11 @@
 # Licensed to PSF under a Contributor Agreement.
 # See http://www.python.org/2.4/license for licensing details.
 
-"""Subprocress execution
+"""Subprocess execution
 
 This module holds a subclass of subprocess.Popen with our own required
 features, mainly that we get access to the subprocess output while it
-is running rather than just at the end. This makes it easiler to show
+is running rather than just at the end. This makes it easier to show
 progress information and filter output in real time.
 """