tests: make comment on GPG keyring match the code

GnuPG homedir is generated on the fly and keys are imported from
armored key file. Make comment match available key info and new key
generation procedure.

Signed-off-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-gpg.sh

@@ -12,10 +12,20 @@ else
 		say "Your version of gpg (1.0.6) is too buggy for testing"
 		;;
 	*)
-		# key generation info: gpg --homedir t/lib-gpg --gen-key
-		# Type DSA and Elgamal, size 2048 bits, no expiration date.
-		# Name and email: C O Mitter <committer@example.com>
+		# Available key info:
+		# * Type DSA and Elgamal, size 2048 bits, no expiration date,
+		#   name and email: C O Mitter <committer@example.com>
+		# * Type RSA, size 2048 bits, no expiration date,
+		#   name and email: Eris Discordia <discord@example.net>
 		# No password given, to enable non-interactive operation.
+		# To generate new key:
+		#	gpg --homedir /tmp/gpghome --gen-key
+		# To write armored exported key to keyring:
+		#	gpg --homedir /tmp/gpghome --export-secret-keys \
+		#		--armor 0xDEADBEEF >> lib-gpg/keyring.gpg
+		# To export ownertrust:
+		#	gpg --homedir /tmp/gpghome --export-ownertrust \
+		#		> lib-gpg/ownertrust
 		mkdir ./gpghome &&
 		chmod 0700 ./gpghome &&
 		GNUPGHOME="$(pwd)/gpghome" &&