package.json: sync gopls settings to match v0.6.10

Change-Id: Ie4115ecec4ed55c482eb8f9efd37da989099f11d
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/309851
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
diff --git a/docs/settings.md b/docs/settings.md
index fe1ccd3..cd432d2 100644
--- a/docs/settings.md
+++ b/docs/settings.md
@@ -600,6 +600,13 @@
 
 
 Default: `"100ms"`
+### `ui.completion.experimentalPostfixCompletions`
+
+(Experimental) experimentalPostfixCompletions enables artifical method snippets
+such as "someSlice.sort!".
+
+
+Default: `false`
 ### `ui.completion.matcher`
 
 (Advanced) matcher sets the algorithm that is used when calculating completion
diff --git a/package.json b/package.json
index 54049d6..6a6b205 100644
--- a/package.json
+++ b/package.json
@@ -1870,6 +1870,12 @@
               "default": "100ms",
               "scope": "resource"
             },
+            "ui.completion.experimentalPostfixCompletions": {
+              "type": "boolean",
+              "markdownDescription": "(Experimental) experimentalPostfixCompletions enables artifical method snippets\nsuch as \"someSlice.sort!\".\n",
+              "default": false,
+              "scope": "resource"
+            },
             "ui.completion.matcher": {
               "type": "string",
               "markdownDescription": "(Advanced) matcher sets the algorithm that is used when calculating completion\ncandidates.\n",