Improve grpc_tls wording in docs. (#14608)

Improve grpc_tls wording in docs.

Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>

website/content/docs/agent/config/config-files.mdx

@@ -604,14 +604,16 @@ Valid time units are 'ns', 'us' (or 'µs'), 'ms', 's', 'm', 'h'."
     (disabled). **We recommend using `8501`** for `https` by convention as some tooling
     will work automatically with this.
   - `grpc` ((#grpc_port)) - The gRPC API, -1 to disable. Default -1 (disabled).
-    **We recommend using `8502`** for `grpc` by convention as some tooling will work
-    automatically with this. This is set to `8502` by default when the agent runs
-    in `-dev` mode. Currently gRPC is only used to expose Envoy xDS API to Envoy
-    proxies.
+    **We recommend using `8502` for `grpc`** as your conventional gRPC port number, as it allows some
+    tools to work automatically. This parameter is set to `8502` by default when the agent runs
+    in `-dev` mode. The `grpc` port currently supports either plaintext or TLS traffic for
+    backwards-compatibility, but TLS support is deprecated and will be removed in a future
+    release. Refer to `grpc_tls` for more information on configuring a TLS-enabled port.
   - `grpc_tls` ((#grpc_tls_port)) - The gRPC API with TLS connections, -1 to disable. Default -1 (disabled).
-    **We recommend using `8502`** for `grpc_tls` by convention as some tooling will work
-    automatically with this. Usually only one of the `grpc_tls` or `grpc` ports should be defined.
-    Currently gRPC is only used to expose Envoy xDS API to Envoy proxies.
+    **We recommend using `8502` for `grpc_tls`** as your conventional gRPC port number, as it allows some 
+    tools to work automatically. `grpc_tls` is always guaranteed to be encrypted. Both `grpc` and `grpc_tls`
+    can be configured at the same time, but they may not utilize the same port number. If both `grpc` and
+    `grpc_tls` are defined, then `grpc` will always be plaintext. This field was added in Consul 1.14.
   - `serf_lan` ((#serf_lan_port)) - The Serf LAN port. Default 8301. TCP
     and UDP. Equivalent to the [`-serf-lan-port` command line flag](/docs/agent/config/cli-flags#_serf_lan_port).
   - `serf_wan` ((#serf_wan_port)) - The Serf WAN port. Default 8302.

website/content/docs/upgrading/upgrade-specific.mdx

@@ -20,25 +20,21 @@ upgrade flow.
 
 ##### Changes to gRPC TLS configuration
 
-**Configuration changes should be made** if using sidecar proxies or gateways
-in conjunction with any of the following:
+**Make configuration changes** if using sidecar proxies or gateways that include any of the following configuration file values:
 1. [`ports.https`](/docs/agent/config/config-files#https_port) - Encrypts gRPC in Consul 1.12 and prior
-2. [`auto_encrypt`](/docs/agent/config/config-files#auto_encrypt) - Encrypts gRPC in Consul 1.13 and prior
-3. [`auto_config`](/docs/agent/config/config-files#auto_config) - Encrypts gRPC in Consul 1.13 and prior
+1. [`auto_encrypt`](/docs/agent/config/config-files#auto_encrypt) - Encrypts gRPC in Consul 1.13 and prior
+1. [`auto_config`](/docs/agent/config/config-files#auto_config) - Encrypts gRPC in Consul 1.13 and prior
 
-Prior to Consul 1.14, it was possible for communication between Consul and Envoy over `ports.grpc`
-to be encrypted by one of these features.
+Prior to Consul 1.14, it was possible to encrypt communication between Consul and Envoy over `ports.grpc` using these settings.
 
-In Consul 1.14, a new [`ports.grpc_tls`](/docs/agent/config/config-files#grpc_tls_port) configuration
-is introduced. The existing [`ports.grpc`](/docs/agent/config/config-files#grpc_port) configuration
-**will stop supporting encryption in a future release**. Now, the recommended way to encrypt gRPC
-traffic is only via `ports.grpc_tls`.
+Consul 1.14 introduces [`ports.grpc_tls`](/docs/agent/config/config-files#grpc_tls_port), a new configuration 
+for encrypting communication over gRPC. The existing [`ports.grpc`](/docs/agent/config/config- 
+files#grpc_port) configuration **will stop supporting encryption in a future release**. As of version 1.14, 
+`ports.grpc_tls` is the recommended configuration to encrypt gRPC traffic.
 
 For most environments, the Envoy communication to Consul is loop-back only and does not benefit from encryption.
 
-If you would like to continue utilizing encryption for gRPC, change the existing `ports.grpc` to `ports.grpc_tls` in
-your configuration during the upgrade to ensure compatibility with future releases.
-
+If you already use gRPC encryption, change the existing `ports.grpc` to `ports.grpc_tls` in your configuration to ensure compatibility with future releases.
 
 ## Consul 1.13.x