Update README.md

Author: ntkme

npm/all-unknown/README.md

@@ -1,3 +1,5 @@
 # `sass-embedded-all-unknown`
 
-This is the **all-unknown** binary for [`sass-embedded`](https://www.npmjs.com/package/sass-embedded)
+This is the pure js optional dependency for [`sass-embedded`](https://www.npmjs.com/package/sass-embedded)
+
+This package does not contain any dart binary. Instead, it installs the `sass` npm package as a transitive dependency on any CPU without native dart support.

npm/all-unknown/package.json

@@ -1,7 +1,7 @@
 {
   "name": "sass-embedded-all-unknown",
   "version": "1.89.2",
-  "description": "The all-unknown binary for sass-embedded",
+  "description": "The pure js optional dependency for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
   "license": "MIT",

npm/unknown-all/README.md

@@ -1,3 +1,5 @@
 # `sass-embedded-unknown-all`
 
-This is the **unknown-all** binary for [`sass-embedded`](https://www.npmjs.com/package/sass-embedded)
+This is the pure js optional dependency for [`sass-embedded`](https://www.npmjs.com/package/sass-embedded)
+
+This package does not contain any dart binary. Instead, it installs the `sass` npm package as a transitive dependency on any OS without native dart support.

npm/unknown-all/package.json

@@ -1,7 +1,7 @@
 {
   "name": "sass-embedded-unknown-all",
   "version": "1.89.2",
-  "description": "The unknown-all binary for sass-embedded",
+  "description": "The pure js optional dependency for sass-embedded",
   "repository": "sass/embedded-host-node",
   "author": "Google Inc.",
   "license": "MIT",