gopls/doc: relnote for hover & definition over doc links

Change-Id: I2d3a571a6fabd1419212b64706f765a058a3cc11
Reviewed-on: https://go-review.googlesource.com/c/tools/+/578320
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

gopls/doc/release/v0.16.0.md

@@ -85,9 +85,30 @@ optimizations to your data structures, or when reading assembly code.
 
 TODO: example hover image.
 
+### Hover and definition on doc links
+
+Go 1.19 added support for [links in doc
+comments](https://go.dev/doc/comment#links), allowing the
+documentation for one symbol to reference another:
+
+TODO: turn the code below into a VS Code screenshot of hover.
+
+```go
+// Logf logs a message formatted in the manner of [fmt.Printf].
+func Logf(format string, args ...any)
+```
+
+Gopls's Hover and Definition operations now treat these links just
+like identifiers, so hovering over one will display information about
+the symbol, and "Go to definition" will navigate to its declaration.
+Thanks to @rogeryk for contributing this feature.
+
+
 ## Bugs fixed
 
 ## Thank you to our contributors!
 
 @guodongli-google for the `unusedwrite` analyzer.
-TODO: they're a xoogler; is there a more current GH account?
+TODO: they're a xoogler; is there a more current GH account?
+
+@rogeryk