Fix typos in models/ and modules/ (#1248)

modules/lfs/server.go

@@ -50,7 +50,7 @@ type BatchResponse struct {
 	Objects  []*Representation `json:"objects"`
 }
 
-// Representation is object medata as seen by clients of the lfs server.
+// Representation is object metadata as seen by clients of the lfs server.
 type Representation struct {
 	Oid     string           `json:"oid"`
 	Size    int64            `json:"size"`