Minor formatting fixes related to htpasswd auth

Signed-off-by: Stephen J Day <stephen.day@docker.com>

docs/configuration.md

@@ -719,7 +719,7 @@ For more information about Token based authentication configuration, see the [sp
 ### htpasswd
 
 The _htpasswd_ authentication backed allows one to configure basic auth using an
-[Apache HTPasswd File](http://httpd.apache.org/docs/2.4/programs/htpasswd.html).
+[Apache HTPasswd File](https://httpd.apache.org/docs/2.4/programs/htpasswd.html).
 Only [`bcrypt`](http://en.wikipedia.org/wiki/Bcrypt) format passwords are
 supported. Entries with other hash types will be ignored. The htpasswd file is
 loaded once, at startup. If the file is invalid, the registry will display and

registry/auth/htpasswd/access_test.go

@@ -85,8 +85,8 @@ func TestBasicAccessController(t *testing.T) {
 	}
 
 	nonbcrypt := map[string]struct{}{
-		"bilbo":   struct{}{},
-		"DeokMan": struct{}{},
+		"bilbo":   {},
+		"DeokMan": {},
 	}
 
 	for i := 0; i < len(testUsers); i++ {