add purchase order changes

Author: RakeshJesadiya

src/guides/v2.3/b2b/bk-b2b.md

@@ -8,8 +8,8 @@ menu_order: 1
 menu_node: parent
 ee_only: True
 functional_areas:
-  - B2B
-  - Integration
+- B2B
+- Integration
 ---
 
 Unlike the standard business-to-consumer model, {{site.data.var.b2b}} (Business to Business) is designed to meet the needs of sellers (Magento merchants) whose customers are primarily companies—possibly with complex organizational structures and multiple users with various roles and levels of permission.
@@ -46,9 +46,12 @@ ConfigurableSharedCatalog |Enables configurable products to be added to a shared
 GiftCardNegotiableQuote | Enables gift cards to be displayed in a negotiable quote in an B2B environment | No
 GiftCardRequisitionList | Enables gift cards to be displayed in a requisition list | No
 GiftCardSharedCatalog | Enables gift cards to be added to a shared catalog in an B2B environment. | No
+GroupedRequisitionList | Enables grouped products to be displayed in a requisition list | No
 GroupedSharedCatalog | Enables grouped products to be added to a shared catalog in an B2B environment. | No
 NegotiableQuote | Allows a buyer and a seller (admin user) to negotiate product and/or shipping prices before the buyer places an order. | Yes
 NegotiableQuoteSharedCatalog | Enables the `NegotiableQuote` module to interact with a `SharedCatalog` in an B2B environment. | No
+PurchaseOrder | Allows buyers and seller to create a purchase order. | Yes
+PurchaseOrderRule | Allows creating and enforcing approval rules for purchase orders. | No
 QuickOrder | Allows buyers to create a new order from a list of multiple SKUs. | No
 RequisitionList | Allows a buyer to create multiple lists of frequently-purchased items and use those lists for order placement. | No
 SharedCatalog | Defines the visibility of products and prices in the catalog and in B2B quotes for different company accounts. | Yes

src/guides/v2.3/b2b/integrations.md

@@ -78,6 +78,12 @@ POST   /V1/negotiable-carts/:cartId/giftCards
 DELETE /V1/negotiable-carts/:cartId/giftCards/:giftCardCode
 ```
 
+### PurchaseOrder
+
+```terminal
+POST   /V1/carts/mine/po-payment-information
+```
+
 ### SharedCatalog
 
 ```terminal
@@ -137,6 +143,12 @@ negotiableQuoteShippingInformationManagementV1
 negotiableQuoteShippingMethodManagementV1
 ```
 
+### PurchaseOrder
+
+```terminal
+purchaseOrderPurchaseOrderPaymentInformationManagementV1
+```
+
 ### SharedCatalog
 
 ```terminal