gopls/doc/release: add semantic token config change

For golang/vscode-go#3632

Change-Id: I8d8a219c380ac8ac07a1baaef3bc89701894b985
Reviewed-on: https://go-review.googlesource.com/c/tools/+/643497
Reviewed-by: Alan Donovan <[email protected]>
Auto-Submit: Hongxiang Jiang <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

gopls/doc/release/v0.18.0.md

@@ -10,6 +10,26 @@
 
   VS Code's special "Go: Toggle GC details" command continues to work.
 
+- The experimental `settings.semanticTokenTypes` configures the semantic token
+  types. It allows disabling types by setting each value to false. By default,
+  all types are enabled.
+
+  The experimental `settings.semanticTokenModifiers` configures the semantic
+  token modifiers. It allows disabling modifiers by setting each value to false.
+  By default, all modifiers are enabled.
+
+  The experimental `settings.noSemanticTokenString` and
+  `settings.noSemanticToken` settings are deprecated in favor of
+  `settings.semanticTokenTypes`.
+
+  Users can set `settings.semanticTokenTypes[string] = false` to achieve the
+  same result as `settings.noSemanticTokenString`. The same applies to
+  `settings.noSemanticTokenNumber`.
+
+  For now, gopls still honors `settings.noSemanticTokenString` and
+  `settings.noSemanticToken`, but will stop honoring the settings in the
+  upcoming release.
+
 # New features
 
 ## "{Show,Hide} compiler optimization details" code action