swarm/shed: fix typos

swarm/shed/field_string.go

@@ -27,7 +27,7 @@ type StringField struct {
 	key []byte
 }
 
-// NewStringField retruns a new Instance fo StringField.
+// NewStringField retruns a new Instance of StringField.
 // It validates its name and type against the database schema.
 func (db *DB) NewStringField(name string) (f StringField, err error) {
 	key, err := db.schemaFieldKey(name, "string")

swarm/shed/field_struct.go

@@ -41,7 +41,7 @@ func (db *DB) NewStructField(name string) (f StructField, err error) {
 	}, nil
 }
 
-// Unmarshal unmarshals data fromt he database to a provided val.
+// Unmarshal unmarshals data fromt the database to a provided val.
 // If the data is not found leveldb.ErrNotFound is returned.
 func (f StructField) Unmarshal(val interface{}) (err error) {
 	b, err := f.db.Get(f.key)

swarm/shed/index.go

@@ -173,7 +173,7 @@ func (f Index) PutInBatch(batch *leveldb.Batch, i IndexItem) (err error) {
 }
 
 // Delete accepts IndexItem to remove a key/value pair
-// form the database based on its fields.
+// from the database based on its fields.
 func (f Index) Delete(keyFields IndexItem) (err error) {
 	key, err := f.encodeKeyFunc(keyFields)
 	if err != nil {

swarm/shed/schema.go

@@ -56,10 +56,10 @@ type indexSpec struct {
 // a particular field form the schema definition.
 func (db *DB) schemaFieldKey(name, fieldType string) (key []byte, err error) {
 	if name == "" {
-		return nil, errors.New("filed name can not be blank")
+		return nil, errors.New("field name can not be blank")
 	}
 	if fieldType == "" {
-		return nil, errors.New("filed type can not be blank")
+		return nil, errors.New("field type can not be blank")
 	}
 	s, err := db.getSchema()
 	if err != nil {