Correct an inaccuracy in the Snappy format description.

(I stumbled into this when changing the way we decompress literals.) 

R=csilvers

Revision created by MOE tool push_codebase.


git-svn-id: https://snappy.googlecode.com/svn/trunk@43 03e5f5b5-db94-4691-08a0-1a8bf15f6143

format_description.txt

@@ -52,7 +52,7 @@ of the literal:
  - For literals up to and including 60 bytes in length, the upper
    six bits of the tag byte contain (len-1). The literal follows
    immediately thereafter in the bytestream.
- - For longer literals, the length is stored after the tag byte,
+ - For longer literals, the (len-1) value is stored after the tag byte,
    little-endian. The upper six bits of the tag byte describe how
    many bytes are used for the length; 60, 61, 62 or 63 for
    1-4 bytes, respectively. The literal itself follows after the