storage: fix minor typos

storage/key_index.go

@@ -27,7 +27,7 @@ var (
 	ErrRevisionNotFound = errors.New("stroage: revision not found")
 )
 
-// keyIndex stores the revision of an key in the backend.
+// keyIndex stores the revisions of a key in the backend.
 // Each keyIndex has at least one key generation.
 // Each generation might have several key versions.
 // Tombstone on a key appends an tombstone version at the end
@@ -146,7 +146,7 @@ func (ki *keyIndex) get(atRev int64) (modified, created revision, ver int64, err
 	return revision{}, revision{}, 0, ErrRevisionNotFound
 }
 
-// since returns revisions since the give rev. Only the revision with the
+// since returns revisions since the given rev. Only the revision with the
 // largest sub revision will be returned if multiple revisions have the same
 // main revision.
 func (ki *keyIndex) since(rev int64) []revision {

storage/revision_test.go

@@ -22,7 +22,7 @@ import (
 )
 
 // TestRevision tests that revision could be encoded to and decoded from
-// bytes slice. Moreover, the lexicograph order of its byte slice representation
+// bytes slice. Moreover, the lexicographical order of its byte slice representation
 // follows the order of (main, sub).
 func TestRevision(t *testing.T) {
 	tests := []revision{