Add beta tags to gateway docs (#7876)

website/pages/docs/agent/config-entries/ingress-gateway.mdx

@@ -1,13 +1,13 @@
 ---
 layout: docs
 page_title: 'Configuration Entry Kind: Ingress Gateway'
-sidebar_title: ingress-gateway
+sidebar_title: ingress-gateway <sup> Beta </sup>
 description: >-
   The `ingress-gateway` config entry kind allows for configuring Ingress gateways
   with listeners that expose a set of services outside the Consul service mesh.
 ---
 
-# Ingress Gateway
+# Ingress Gateway <sup> Beta </sup>
 
 -> **1.8.0+:** This config entry is available in Consul versions 1.8.0 and newer.
 

website/pages/docs/agent/config-entries/terminating-gateway.mdx

@@ -1,13 +1,13 @@
 ---
 layout: docs
 page_title: 'Configuration Entry Kind: Terminating Gateway'
-sidebar_title: terminating-gateway
+sidebar_title: terminating-gateway <sup> Beta </sup>
 description: >-
   The `terminating-gateway` config entry kind allows for configuring terminating gateways
   to proxy traffic from services in the Consul service mesh to services outside the mesh.
 ---
 
-# Terminating Gateway
+# Terminating Gateway <sup> Beta </sup>
 
 -> **1.8.0+:** This config entry is available in Consul versions 1.8.0 and newer.
 

website/pages/docs/connect/ingress_gateway.mdx

@@ -1,14 +1,14 @@
 ---
 layout: docs
 page_title: Connect - Ingress Gateways
-sidebar_title: Ingress Gateways
+sidebar_title: Ingress Gateways <sup> Beta </sup>
 description: >-
   An ingress gateway enables ingress traffic from services outside the Consul
   service mesh to services inside the Consul service mesh. This section details
   how to use Envoy and describes how you can plug in a gateway of your choice.
 ---
 
-# Ingress Gateways
+# Ingress Gateways <sup> Beta </sup>
 
 -> **1.8.0+:**  This feature is available in Consul versions 1.8.0 and newer.
 

website/pages/docs/connect/terminating_gateway.mdx

@@ -1,14 +1,14 @@
 ---
 layout: docs
 page_title: Connect - Terminating Gateways
-sidebar_title: Terminating Gateways
+sidebar_title: Terminating Gateways <sup> Beta </sup>
 description: >-
   A terminating gateway enables traffic from services in the Consul
   service mesh to services outside the mesh. This section details
   how to configure and run a terminating gateway.
 ---
 
-# Terminating Gateways
+# Terminating Gateways <sup> Beta </sup>
 
 -> **1.8.0+:**  This feature is available in Consul versions 1.8.0 and newer.