Fix Godoc typos

Signed-off-by: Andy Goldstein <agoldste@redhat.com>

docs/auth/auth.go

@@ -110,7 +110,7 @@ func (uic userInfoContext) Value(key interface{}) interface{} {
 }
 
 // InitFunc is the type of an AccessController factory function and is used
-// to register the contsructor for different AccesController backends.
+// to register the constructor for different AccesController backends.
 type InitFunc func(options map[string]interface{}) (AccessController, error)
 
 var accessControllers map[string]InitFunc

docs/middleware/registry/middleware.go

@@ -7,7 +7,7 @@ import (
 )
 
 // InitFunc is the type of a RegistryMiddleware factory function and is
-// used to register the contsructor for different RegistryMiddleware backends.
+// used to register the constructor for different RegistryMiddleware backends.
 type InitFunc func(registry distribution.Registry, options map[string]interface{}) (distribution.Registry, error)
 
 var middlewares map[string]InitFunc

docs/middleware/repository/middleware.go

@@ -7,7 +7,7 @@ import (
 )
 
 // InitFunc is the type of a RepositoryMiddleware factory function and is
-// used to register the contsructor for different RepositoryMiddleware backends.
+// used to register the constructor for different RepositoryMiddleware backends.
 type InitFunc func(repository distribution.Repository, options map[string]interface{}) (distribution.Repository, error)
 
 var middlewares map[string]InitFunc

docs/storage/driver/middleware/storagemiddleware.go

@@ -7,7 +7,7 @@ import (
 )
 
 // InitFunc is the type of a StorageMiddleware factory function and is
-// used to register the contsructor for different StorageMiddleware backends.
+// used to register the constructor for different StorageMiddleware backends.
 type InitFunc func(storageDriver storagedriver.StorageDriver, options map[string]interface{}) (storagedriver.StorageDriver, error)
 
 var storageMiddlewares map[string]InitFunc