feat: [documentai] Add API fields for the descriptions of entity type…

… and property in the document schema (#5662)

* feat: Add API fields for the descriptions of entity type and property in the document schema

PiperOrigin-RevId: 671472365

Source-Link: googleapis/googleapis@003e626

Source-Link: googleapis/googleapis-gen@bf0196f
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packages/google-cloud-documentai/protos/google/cloud/documentai/v1beta3/document_schema.proto

@@ -127,6 +127,10 @@ message DocumentSchema {
       // EntityType name.
       string name = 1;
 
+      // The description of the property. Could be used to provide more
+      // information about the property for model calls.
+      string description = 7;
+
       // User defined name for the property.
       string display_name = 6;
 
@@ -169,6 +173,10 @@ message DocumentSchema {
     //   honored for backward compatibility.
     string name = 1;
 
+    // The description of the entity type. Could be used to provide more
+    // information about the entity type for model calls.
+    string description = 15;
+
     // The entity type that this type is derived from.  For now, one and only
     // one should be set.
     repeated string base_types = 2;