docs: Correct coap IPV6 support requirement comments

coap (libcoap) can now be built with or without IPV6.

components/lwip/Kconfig

@@ -458,7 +458,7 @@ menu "LWIP"
         default y
         help
             Enable IPv6 function. If not use IPv6 function, set this option to n.
-            If disabling LWIP_IPV6 then some other components (coap and asio) will
+            If disabling LWIP_IPV6 then some other components (asio) will
             no longer be available.
 
     config LWIP_IPV6_AUTOCONFIG

docs/en/api-guides/performance/size.rst

@@ -441,7 +441,7 @@ lwIP IPv6
 
   .. note::
 
-      IPv6 is required by some components such as ``coap`` and :doc:`/api-reference/protocols/asio`. These components will not be available if IPV6 is disabled.
+      IPv6 is required by some components such as :doc:`/api-reference/protocols/asio`. These components will not be available if IPV6 is disabled.
 
 lwIP IPv4
 @@@@@@@@@

docs/zh_CN/api-guides/performance/size.rst

@@ -441,7 +441,7 @@ lwIP IPv6
 
   .. note::
 
-      如果禁用 IPv6， ``coap`` 和 :doc:`/api-reference/protocols/asio` 等组件将无法使用。
+      如果禁用 IPv6，:doc:`/api-reference/protocols/asio` 等组件将无法使用。
 
 lwIP IPv4
 @@@@@@@@@