Modify description file to say what this file is

A lot of people see this message for the first time on the gitweb
interface, where there is no clue as to what 'this file' means.
Signed-off-by: NJohn Tapsell <johnflux@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

templates/hooks--update.sample

@@ -43,10 +43,12 @@ allowdeletetag=$(git config --bool hooks.allowdeletetag)
 
 # check for no description
 projectdesc=$(sed -e '1q' "$GIT_DIR/description")
-if [ -z "$projectdesc" -o "$projectdesc" = "Unnamed repository; edit this file to name it for gitweb." ]; then
+case "$projectdesc" in
+"Unnamed repository"* | "")
 	echo "*** Project description file hasn't been set" >&2
 	exit 1
-fi
+	;;
+esac
 
 # --- Check types
 # if $newrev is 0000...0000, it's a commit to delete a ref.

templates/this--description

-Unnamed repository; edit this file to name it for gitweb.
+Unnamed repository; edit this file 'description' to name the repository.