Merge pull request #740 from ericchiang/fix-comment-typos

*: fix comment typos and add go report card icon

storage/conformance/conformance.go

@@ -62,7 +62,7 @@ func mustLoadJWK(b string) *jose.JSONWebKey {
 func mustBeErrNotFound(t *testing.T, kind string, err error) {
 	switch {
 	case err == nil:
-		t.Errorf("deleting non-existant %s should return an error", kind)
+		t.Errorf("deleting non-existent %s should return an error", kind)
 	case err != storage.ErrNotFound:
 		t.Errorf("deleting %s expected storage.ErrNotFound, got %v", kind, err)
 	}

storage/sql/crud.go

@@ -13,7 +13,7 @@ import (
 )
 
 // TODO(ericchiang): The update, insert, and select methods queries are all
-// very repetivite. Consider creating them programatically.
+// very repetitive. Consider creating them programmatically.
 
 // keysRowID is the ID of the only row we expect to populate the "keys" table.
 const keysRowID = "keys"