Adds a note about workspaces in the enableScripts documentation (#4781)

Update yarnrc.json

Author: arcanis

packages/gatsby/static/configuration/yarnrc.json

@@ -171,7 +171,7 @@
     },
     "enableScripts": {
       "_package": "@yarnpkg/core",
-      "description": "If false, Yarn will not execute the `postInstall` scripts when installing the project. Note that you can now also disable scripts on a per-package basis thanks to `dependenciesMeta`.",
+      "description": "If false, Yarn will not execute the `postinstall` scripts from third-party packages when installing the project (workspaces will still see their postinstall scripts evaluated, as they're assumed to be safe if you're running an install within them). Note that you can now also disable scripts on a per-package basis thanks to `dependenciesMeta`.",
       "type": "boolean",
       "default": true
     },