README: wrap doc/index.txt reference in backticks
authorW. Trevor King <wking@tremily.us>
Sat, 27 Oct 2012 16:38:55 +0000 (12:38 -0400)
committerW. Trevor King <wking@tremily.us>
Sat, 27 Oct 2012 16:38:59 +0000 (12:38 -0400)
commitefbfa3d8671da280615daeeb8682e86ff9160297
tree3a3ec12995d2392927c67b1d35f55c3a1176858b
parentcf2dccfb50ccddb1d0a308f8f15f0a9362c57e2b
README: wrap doc/index.txt reference in backticks

File names, code, etc., should have special markup so they aren't
confused with regular text.
README