Fix comment drift in assorted relocation packer modules.

Some of the commentary in relocation packer code is relevant
only to the packing strategy employed by chromium, and no
longer applies here.  This change fixes or deletes it.

Code comment change only; no functional effect.

Change-Id: Id229ee1d802bba608be15b79bc75bf90df557dab
Signed-off-by: Simon Baldwin <simonb@google.com>
diff --git a/tools/relocation_packer/src/sleb128.h b/tools/relocation_packer/src/sleb128.h
index fa0a246..3a63f66 100644
--- a/tools/relocation_packer/src/sleb128.h
+++ b/tools/relocation_packer/src/sleb128.h
@@ -4,9 +4,8 @@
 
 // SLEB128 encoder and decoder for packed relative relocations.
 //
-// Delta encoded relative relocations consist of a large number
-// of pairs signed integer values, many with small values.  Encoding these
-// as signed LEB128 saves space.
+// Packed relocations consist of a large number of relatively small
+// integer values.  Encoding these as LEB128 saves space.
 //
 // For more on LEB128 see http://en.wikipedia.org/wiki/LEB128.