Fix tabs-to-spaces in SUBMITTING_PATCHES

Change-Id: I1cf5b4355a147c39107c8b97e56108f482c96d8d
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

SUBMITTING_PATCHES

@@ -5,7 +5,7 @@ Short Version:
 
  - Review and follow the Eclipse Due Diligence Process
 
-	 http://www.eclipse.org/projects/dev_process/ip-process-in-cartoons.php
+     http://www.eclipse.org/projects/dev_process/ip-process-in-cartoons.php
      http://www.eclipse.org/legal/EclipseLegalProcessPoster.pdf
 
  - Review and follow the current guidelines:
@@ -165,16 +165,16 @@ if you can certify the below:
             other person who certified (a), (b) or (c) and I have
             not modified it.
 
-	(d) I understand and agree that this project and the
-	    contribution are public and that a record of the
-	    contribution (including all personal information I
-	    submit with it, including my sign-off) is maintained
-	    indefinitely and may be redistributed consistent with
-	    this project or the open source license(s) involved.
+        (d) I understand and agree that this project and the
+            contribution are public and that a record of the
+            contribution (including all personal information I
+            submit with it, including my sign-off) is maintained
+            indefinitely and may be redistributed consistent with
+            this project or the open source license(s) involved.
 
 then you just add a line saying
 
-	Signed-off-by: Random J Developer <random@developer.example.org>
+    Signed-off-by: Random J Developer <random@developer.example.org>
 
 This line can be automatically added by git if you run the git-commit
 command with the -s option.