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/leb128.h b/tools/relocation_packer/src/leb128.h
index 2c5b5d0..67fc4b8 100644
--- a/tools/relocation_packer/src/leb128.h
+++ b/tools/relocation_packer/src/leb128.h
@@ -4,9 +4,8 @@
 
 // LEB128 encoder and decoder for packed relative relocations.
 //
-// Run-length encoded relative relocations consist of a large number
-// of pairs of relatively small positive integer values.  Encoding these as
-// 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.