extension: update gopls v0.18.1-pre.1 settings

This is an automated CL which updates the gopls version and settings.

For golang/go#71882

Change-Id: Ib189aac783f1d6ab4498aaf7d4fe828aa491d135
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/651218
Auto-Submit: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
kokoro-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>

Author: gopherbot

docs/settings.md

@@ -850,7 +850,16 @@ Default: `false`
 hoverKind controls the information that appears in the hover text.
 SingleLine is intended for use only by authors of editor plugins.
 <br/>
-Allowed Options: `FullDocumentation`, `NoDocumentation`, `SingleLine`, `SynopsisDocumentation`
+Allowed Options:
+
+* `FullDocumentation`
+* `NoDocumentation`
+* `SingleLine`
+* `Structured`: `"Structured"` is a misguided experimental setting that returns a JSON
+hover format. This setting should not be used, as it will be removed in a
+future release of gopls.
+* `SynopsisDocumentation`
+
 
 Default: `"FullDocumentation"`
 ### `ui.documentation.linkTarget`

extension/package.json

@@ -2428,12 +2428,14 @@
                 "FullDocumentation",
                 "NoDocumentation",
                 "SingleLine",
+                "Structured",
                 "SynopsisDocumentation"
               ],
               "markdownEnumDescriptions": [
                 "",
                 "",
                 "",
+                "`\"Structured\"` is a misguided experimental setting that returns a JSON\nhover format. This setting should not be used, as it will be removed in a\nfuture release of gopls.\n",
                 ""
               ],
               "default": "FullDocumentation",