docs: Update property requirement specifications

Google APIs · copybara-github · commit 3303b93dc165 · 2023-08-17T10:17:44.000-07:00
PiperOrigin-RevId: 557861399
diff --git a/google/datastore/v1/query.proto b/google/datastore/v1/query.proto
@@ -279,8 +279,13 @@ message KindExpression {
 
 // A reference to a property relative to the kind expressions.
 message PropertyReference {
-  // The name of the property.
-  // If name includes "."s, it may be interpreted as a property name path.
+  // A reference to a property.
+  //
+  // Requires:
+  //
+  // * MUST be a dot-delimited (`.`) string of segments, where each segment
+  // conforms to [entity property name][google.datastore.v1.Entity.properties]
+  // limitations.
   string name = 2;
 }
 
