docs: clarify text in npm-link.md (#21019)

I wasn't clear on the exact behaviour with the shorthand, but I think this change is correct. PR-URL: #21019 Credit: @davidgilbertson Reviewed-By: @zkat

Author: davidgilbertson

doc/cli/npm-link.md

@@ -53,11 +53,14 @@ above use-case in a shorter way:
 The second line is the equivalent of doing:
 
  (cd ../node-redis; npm link)
- npm link node-redis
+ npm link redis
 
 That is, it first creates a global link, and then links the global
 installation target into your project's `node_modules` folder.
 
+Note that in this case, you are referring to the directory name, `node-redis`,
+rather than the package name `redis`.
+
 If your linked package is scoped (see `npm-scope(7)`) your link command must
 include that scope, e.g.