fix: add better hint for before and clean up description

Author: wraithgar

workspaces/config/lib/definitions/definitions.js

@@ -230,12 +230,13 @@ const definitions = {
   }),
   before: new Definition('before', {
     default: null,
+    hint: '<date>',
     type: [null, Date],
     description: `
       If passed to \`npm install\`, will rebuild the npm tree such that only
-      versions that were available **on or before** the \`--before\` time get
-      installed.  If there's no versions available for the current set of
-      direct dependencies, the command will error.
+      versions that were available **on or before** the given date are
+      installed.  If there are no versions available for the current set of
+      dependencies, the command will error.
 
       If the requested version is a \`dist-tag\` and the given tag does not
       pass the \`--before\` filter, the most recent version less than or equal