The path format was inconsistent with the one used in git-notes.sh: it
supposedly split the sha1 in the same 2/38 format that .git/objects
uses, but the code uses the full sha1 without a path separator.
While at it, also fix a grammatical error.
Signed-off-by: Thomas Rast <trast@student.ethz.ch> Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>