Mention that BSD-style lwIP TCP/IP stack support on Windows is experimental.

RELEASE-NOTES

@@ -12,7 +12,7 @@ This release includes the following changes:
  o Added CURLOPT_GSSAPI_DELEGATION
  o Added support for NTLM delegation to Samba's winbind daemon helper ntlm_auth
  o Display notes from setup file in testcurl.pl
- o BSD-style lwIP TCP/IP stack support on Windows
+ o BSD-style lwIP TCP/IP stack experimental support on Windows
  o OpenSSL: Use SSL_MODE_RELEASE_BUFFERS if available
  o --delegation was added to set CURLOPT_GSSAPI_DELEGATION
  o nss: start with no database if the selected database is broken

docs/INSTALL

@@ -491,6 +491,9 @@ Win32
    http://download.savannah.gnu.org/releases/lwip/lwip-1.4.0.zip
    http://download.savannah.gnu.org/releases/lwip/contrib-1.4.0.zip
 
+   This BSD-style lwIP TCP/IP stack support must be considered experimental
+   given that it has been verified that lwIP 1.4.0 still needs some polish,
+   and libcurl might yet need some additional adjustment, caveat emptor.
 
    Important static libcurl usage note
    -----------------------------------