chore(gazelle): clarify a particular failure message (#939)

gazelle/manifest/test/test.go

diff --git a/gazelle/manifest/test/test.go b/gazelle/manifest/test/test.go
index 8b580b1..207923c 100644
--- a/gazelle/manifest/test/test.go
+++ b/gazelle/manifest/test/test.go
@@ -77,7 +77,7 @@
 			log.Fatalf("ERROR: %v\n", err)
 		}
 		log.Fatalf(
-			"ERROR: %q is out-of-date, follow the intructions on this file for updating.\n",
+			"ERROR: %q is out-of-date. Follow the update instructions in that file to resolve this.\n",
 			manifestRealpath)
 	}
 }