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/gitutil.py b/tools/patman/gitutil.py
index dce7fa2..a2a225c 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -23,7 +23,7 @@
 
     Args:
         commit_range: Range expression to use for log, None for none
-        git_dir: Path to git repositiory (None to use default)
+        git_dir: Path to git repository (None to use default)
         oneline: True to use --oneline, else False
         reverse: True to reverse the log (--reverse)
         count: Number of commits to list, or None for no limit
@@ -166,7 +166,7 @@
         git_dir: Directory containing git repo
         range_expr: Range to check
     Return:
-        Number of patches that exist in the supplied rangem or None if none
+        Number of patches that exist in the supplied range or None if none
         were found
     """
     pipe = [LogCmd(range_expr, git_dir=git_dir, oneline=True)]