chore: add docs to explain property values more

deps/db/src/logseq/db/frontend/malli_schema.cljs

@@ -361,7 +361,7 @@
     page-or-block-attrs)))
 
 (def property-value-block
-  "A closed value for a property with closed/allowed values"
+  "A common property value for user properties"
   (vec
    (concat
     [:map]

deps/db/src/logseq/db/frontend/property/type.cljs

@@ -36,12 +36,14 @@
 
 (def value-ref-property-types
   "Property value ref types where the refed entities either store their value in
-  :property.value/content or block/content"
+  :property.value/content or :block/content (for :default)"
   (into #{:default}
         original-value-ref-property-types))
 
 (def ref-property-types
-  "User facing ref types"
+  "User facing ref types. Property values that users see are stored in either
+  :property.value/content, :block/content or :block/original-name.
+  :block/original-name is for all the page related types"
   (into #{:page :date :object} value-ref-property-types))
 
 (assert (set/subset? ref-property-types