Update entity-categories.md

Updating Age to be a subcategory of the Quantity entity category (previously was it's own entity category, which did not match the API output, as seen on this ICM https://portal.microsofticm.com/imp/v3/incidents/details/415902545/home)

Author: renaaliu

articles/ai-services/language-service/personally-identifiable-information/concepts/entity-categories.md

@@ -384,29 +384,52 @@ The entity in this category can have the following subcategories.
 :::row-end:::
 
 
-## Category: Age
+## Category: Quantity
 
 This category contains the following entities:
 
 :::row:::
     :::column span="":::
         **Entity**
 
-           Age
+        Quantity
 
     :::column-end:::
     :::column span="2":::
         **Details**
 
-        Ages. 
+        Numbers and numeric quantities.
+      
+    :::column-end:::
+    :::column span="2":::
+      **Supported document languages**
+
+      `en`, `es`, `fr`, `de`, `it`, `zh-hans`, `ja`, `ko`, `pt-pt`, `pt-br`
+      
+   :::column-end:::
+:::row-end:::
+
+#### Subcategories
+
+The entity in this category can have the following subcategories.
+
+:::row:::
+    :::column span="":::
+        **Entity subcategory**
+
+        Age
 
-        To get this entity category, add `Age` to the `piiCategories` parameter. `Age` will be returned in the API response if detected.
+    :::column-end:::
+    :::column span="2":::
+        **Details**
 
+        Ages.
+      
     :::column-end:::
     :::column span="2":::
-        **Supported document languages**
+      **Supported document languages**
 
-      `en`, `es`, `fr`, `de`, `it`, `zh-hans`, `ja`, `ko`, `pt-pt`, `pt-br`  
+      `en`, `es`, `fr`, `de`, `it`, `zh-hans`, `pt-pt`, `pt-br`   
       
    :::column-end:::
 :::row-end:::