doc: fix typo in packages.md

"previous" read like it should be "previously"

PR-URL: #44005
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Feng Yu <F3n67u@outlook.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: jtoar

doc/api/packages.md

@@ -257,7 +257,7 @@ likely be a breaking change.**
 To make the introduction of [`"exports"`][] non-breaking, ensure that every
 previously supported entry point is exported. It is best to explicitly specify
 entry points so that the package's public API is well-defined. For example,
-a project that previous exported `main`, `lib`,
+a project that previously exported `main`, `lib`,
 `feature`, and the `package.json` could use the following `package.exports`:
 
 ```json