snippet/go.json: add code snippet for variable block

This PR adds a code snippet for creating a variable block. It also fixes running instructions for the mac in the contributing guide.

Change-Id: Id53db46887b6bb2efbe71ab2e8f03837808d331c
GitHub-Last-Rev: b5a8b7c5c8c7e5ef4131b2db29c27a838336e7fc
GitHub-Pull-Request: golang/vscode-go#2481
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/434255
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
diff --git a/docs/contributing.md b/docs/contributing.md
index 48a7581..5d46163 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -69,13 +69,13 @@
 
 ### Run
 
-To run the extension with your patch, open the Run view (`Ctrl+Shift+D`), select `Launch Extension`, and click the Play button (`F5`).
+To run the extension with your patch, open the Run view (`Ctrl+Shift+D` or `⌘+⇧+D`), select `Launch Extension`, and click the Play button (`F5`).
 
 This will open a new VS Code window with the title `[Extension Development Host]`. You can then open a folder that contains Go code and try out your changes.
 
 You can also set breakpoints to debug your change.
 
-If you make subsequent edits in the codebase, you can reload (`Ctrl+R`) the `[Extension Development Host]` instance of VS Code, which will load the new code. The debugger will automatically reattach.
+If you make subsequent edits in the codebase, you can reload (`Ctrl+R` or `⌘+R`) the `[Extension Development Host]` instance of VS Code, which will load the new code. The debugger will automatically reattach.
 
 ## Test
 
diff --git a/snippets/go.json b/snippets/go.json
index 53d0967..83890d5 100644
--- a/snippets/go.json
+++ b/snippets/go.json
@@ -45,11 +45,16 @@
 			"body": "func $1($2) $3 {\n\t$0\n}",
 			"description": "Snippet for function declaration"
 		},
-		"variable declaration": {
+		"single variable": {
 			"prefix": "var",
 			"body": "var ${1:name} ${2:type}",
 			"description": "Snippet for a variable"
 		},
+		"multiple variables": {
+			"prefix": "vars",
+			"body": "var (\n\t${1:name} ${2:type}\n)",
+			"description": "Snippet for variable block"
+		},
 		"switch statement": {
 			"prefix": "switch",
 			"body": "switch ${1:expression} {\ncase ${2:condition}:\n\t$0\n}",