Add recommended snip shortcuts (#1333)

- These shortcuts are unambiguous for navigating snippets in VSCode

Thanks to @AndreasArvidsson for [the
example](https://github.com/AndreasArvidsson/andreas-talon/blob/59cfecd26c3a01e72847364f6cafb5cdb8202b1b/apps/vscode/vscode.talon#L239)

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

apps/vscode/vscode.talon

@@ -54,6 +54,10 @@ show shortcuts: user.vscode("workbench.action.openGlobalKeybindings")
 show shortcuts json: user.vscode("workbench.action.openGlobalKeybindingsFile")
 show snippets: user.vscode("workbench.action.openSnippets")
 
+# VSCode Snippets
+snip (last | previous): user.vscode("jumpToPrevSnippetPlaceholder")
+snip next: user.vscode("jumpToNextSnippetPlaceholder")
+
 # Display
 centered switch: user.vscode("workbench.action.toggleCenteredLayout")
 fullscreen switch: user.vscode("workbench.action.toggleFullScreen")