Fix small typo that lintian shows me every time I compile deb package.
Signed-off-by: Artem Leshchev <matshch@gmail.com>
[rlb@defaultvalue.org: adjust commit message]
Reviewed-by: Rob Browning <rlb@defaultvalue.org>
# DESCRIPTION
`bup index` manipulates the filesystem index, which is a cache of
-absolute paths and their metadata (atttributes, SHA-1 hashes, etc.).
+absolute paths and their metadata (attributes, SHA-1 hashes, etc.).
The bup index is similar in function to the `git`(1) index, and the
default index can be found in `$BUP_DIR/bupindex`.