fix(cli): reword manifest (#6154)

Author: Masato Ohba

src/reporters/lang/en.js

@@ -69,7 +69,7 @@ const messages = {
     "Couldn't find any versions for $0 that matches $1 in our cache (possible versions are $2). This is usually caused by a missing entry in the lockfile, running Yarn without the --offline flag may help fix this issue.",
   couldntFindVersionThatMatchesRange: "Couldn't find any versions for $0 that matches $1",
   chooseVersionFromList: 'Please choose a version of $0 from this list:',
-  moduleNotInManifest: "This module isn't specified in a manifest.",
+  moduleNotInManifest: "This module isn't specified in a package.json file.",
   moduleAlreadyInManifest: '$0 is already in $1. Please remove existing entry first before adding it to $2.',
   unknownFolderOrTarball: "Passed folder/tarball doesn't exist,",
   unknownPackage: "Couldn't find package $0.",