Revise README

Mostly the note on 'multiflac' [sic, should be metaflac] was outdated.

Then some formatting and fix disc->disk because they mean the same thing (just one is Anglicized) and disk is my preference.

README

@@ -1,16 +1,19 @@
-It can split FLAC and WAVE files based on a cuesheet. Features I remember:
+Flacsplit splits FLAC and WAVE files based on a cuesheet.
+
+Features:
  - Add a 'REM OFFSET <N>' line to a cuesheet to add <N> to all track numbers
-   for file naming and tagging purposes. For multi-disc albums.
+   for file naming and tagging purposes. For multi-disk albums.
  - Cuesheets can be UTF-8 or ISO8859-1.
  - Pathnames are sanitized to alphanumeric characters and spaces only. Accents
    are stripped for everything up to and including Latin Extended-A, and ß,
    [Ðð], [Þþ], [Ææ], [Œœ], are translated to ss, Dh/dh, Th/th, Ae/ae, Oe/oe.
    All other characters stripped.
    - This caused a problem with Sigur Ros' album '( )' on FAT32 since it
-     sanitizes to just ' '.  I have no better solution than hard-coding
-     that case.
+     sanitizes to just ' '.  I have no better solution than hard-coding that
+     case.
  - FLAC files always encoded with --best.
- - Replaygain information added with multiflac.
+ - Writes Replaygain. Does not produce consistent results for multi-disk
+   albums, but it's close enough.
 
 Build dependencies: cmake, flex, yacc
 Runtime dependencies: boost, flac (with C++ bindings), icu, sox