doc: add information to revoked deprecations

Revoked deprecations are supposed to have some sort of
information explaining why the deprecation was reversed. This
commit adds some information to the two existing revoked
deprecations.

PR-URL: #27952
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/deprecations.md

@@ -796,7 +796,9 @@ changes:
 
 Type: Deprecation revoked
 
-The [`fs.lchown(path, uid, gid, callback)`][] API is deprecated.
+The [`fs.lchown(path, uid, gid, callback)`][] API was deprecated. The
+deprecation was revoked because the requisite supporting APIs were added in
+libuv.
 
 <a id="DEP0038"></a>
 ### DEP0038: fs.lchownSync(path, uid, gid)
@@ -816,7 +818,8 @@ changes:
 
 Type: Deprecation revoked
 
-The [`fs.lchownSync(path, uid, gid)`][] API is deprecated.
+The [`fs.lchownSync(path, uid, gid)`][] API was deprecated. The deprecation was
+revoked because the requisite supporting APIs were added in libuv.
 
 <a id="DEP0039"></a>
 ### DEP0039: require.extensions