fixup! Add first cut of git-credential-fdoss

Make the description of NewSecretService clearer by linking to the spec
on "sessions" and qualifying the word "session" in the error case. Fix
typo.

Addresses: #3 (comment)

dbus.go

@@ -37,12 +37,14 @@ type Secret struct {
 
 // NewSecretService constructs and returns a SecretService for acting as a
 // client on the DBus session bus to the Secret Service. It establishes a
-// session with the secret service. The session is configured only with "plain"
-// encryption currently (i.e. no encryption). Encrypted sessions are still to
-// be implemented.
+// [session] with the secret service. The session is configured only with
+// "plain" encryption currently (i.e. no encryption). Encrypted sessions are
+// still to be implemented.
 //
-// If the connection to DBus could not be established or the session could not
-// be created, an error is retured instead.
+// If the connection to DBus could not be established or if the secret service
+// session could not be created, an error is returned instead.
+//
+// [session]: https://specifications.freedesktop.org/secret-service-spec/0.2/sessions.html
 func NewSecretService() (*SecretService, error) {
 	conn, err := dbus.SessionBus()
 	if err != nil {