Make docs clearer that package handle is a RegExp only (#4282)

Co-authored-by: Alexei Mochalov <[email protected]>

docs/Catalog/Preferences.md

@@ -83,7 +83,7 @@ or is empty the feature "Add files from Bucket" is disabled
 that is selected by default; if it doesn't match any bucket then it's ignored
 * `ui.package_description` - a dictionary
 that maps package handle regular expressions
-or literals to JSONPath expressions of fields to show from package metadata
+to JSONPath expressions of fields to show from package metadata
 in the package list view.
 * `ui.package_description_multiline: True` - expands package metadata's root key/values
 * `ui.athena.defaultWorkgroup` - default workgroup to select on the Athena page
@@ -122,7 +122,7 @@ ui:
       user_meta:
         - $.labels
     # for any package with a handle prefix of foo
-    foo/*:
+    ^foo/.*:
       # JSONPath expressions to the fields to display
       user_meta:
         - $.key1.key2