DOCSP-12957: [VSCODE] Hover over a field name to show a type value written as text (mongodb#34)

Author: steveren

source/databases-collections.txt

@@ -81,7 +81,8 @@ collection documents have the same shape.
 When you expand a collection's schema, |vsce| lists the fields which
 appear in that collection's documents. If a field exists in all
 documents and its type is consistent throughout the collection, |vsce|
-displays an icon indicating that field's data type.
+displays an icon indicating that field's data type. Hover over the
+field name for a text description of the field's data type.
 
 Manage Indexes
 ~~~~~~~~~~~~~~