Update readme.adoc

readme.adoc

@@ -388,11 +388,11 @@ now a no-op.
 ** Overhaul the Mill client-server protocol to improve robustness
 {link-pr}/3363[#3363] {link-pr}/3366[#3366] {link-pr}/3368[#3368] {link-pr}/3370[#3370]
 
-** Mill now publishes unit, integration, and example test fixtures for writing plugins as `mill-testkit`
+** Mill now has explicitly supported workflows for third-party plugin authors, and 
+publishes unit, integration, and example test fixtures for writing plugins as `mill-testkit`
 {link-pr}/3398[#3398] for downstream plugin authors to use in testing their own Mill extensions.
 
-*** See the documentation for
-https://mill-build.org/mill/Writing_Mill_Plugins.html[Writing Mill Plugins] for more details.
+*** See https://mill-build.org/mill/Writing_Mill_Plugins.html[Writing Mill Plugins] for more details.
 
 *** `mill-testkit` is experimental and does not provide the same stability or binary-compatibility
 guarantees as the rest of Mill. Nevertheless, if you are writing Mill plugins, please try it out