Added some notes about TLS and browser Secure Contexts (#26946)

* Added some notes about TLS and browser Secure Contexts

* Fixed an unrelated indent and color for note

* Bolding word to add visual distinction

website/content/docs/browser-support.mdx

@@ -17,4 +17,6 @@ Vault currently supports all 'evergreen' and updated browsers. the following bro
 
 !> **Warning**: Using an unsupported browser such as Internet Explorer 11 (IE 11) may cause degradation in feature functionality, and in some cases, Vault features may not operate. We encourage using one of the supported browsers listed for Vault UI.
 
+~> **Note**: Some UI features, such as the [Clipboard](https://developer.mozilla.org/en-US/docs/Web/API/Clipboard), require a [secure context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts). They may not function as expected if TLS is not enabled, or for some other reason a secure context is not available.
+
 Please note that HashiCorp, in alignment with Microsoft's stance on IE 11, no longer supports Internet Explorer 11 (IE 11). For further information on IE 11, please reference Microsoft's [support site](https://docs.microsoft.com/en-US/lifecycle/faq/internet-explorer-microsoft-edge).

website/content/docs/configuration/listener/tcp.mdx

@@ -148,7 +148,8 @@ default value in the `"/sys/config/ui"` [API endpoint](/vault/api-docs/system/co
 
 - `tls_disable` `(string: "false")` – Specifies if TLS will be disabled. Vault
   assumes TLS by default, so you must explicitly disable TLS to opt-in to
-  insecure communication.
+  insecure communication. Disabling TLS can **disable** some UI functionality. See
+  the [Browser Support](/vault/docs/browser-support) page for more details.
 
 - `tls_cert_file` `(string: <required-if-enabled>, reloads-on-SIGHUP)` –
   Specifies the path to the certificate for TLS. It requires a PEM-encoded file.
@@ -176,7 +177,7 @@ default value in the `"/sys/config/ui"` [API endpoint](/vault/api-docs/system/co
 - `tls_max_version` `(string: "tls13")` – Specifies the maximum supported
   version of TLS. Accepted values are "tls10", "tls11", "tls12" or "tls13".
 
-~> **Warning**: TLS 1.1 and lower (`tls10` and `tls11` values for the
+  ~> **Warning**: TLS 1.1 and lower (`tls10` and `tls11` values for the
   `tls_min_version` and `tls_max_version` parameters) are widely considered
   insecure.