internal/lsp/template: add missed hover cases

Templates were reporting 'oops' when hovering over a string.

Fixes: golang/go#50031

Change-Id: I9e256b1f7d193bf090590c1ec71e85fc8493d7f7
Reviewed-on: https://go-review.googlesource.com/c/tools/+/369956
Run-TryBot: Peter Weinberger <[email protected]>
gopls-CI: kokoro <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Trust: Peter Weinberger <[email protected]>
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>

Author: pjweinbgo

internal/lsp/template/implementations.go

@@ -118,6 +118,12 @@ func Hover(ctx context.Context, snapshot source.Snapshot, fh source.FileHandle,
 		ans.Contents.Value = fmt.Sprintf("template %s\n(add definition)", sym.name)
 	case protocol.Namespace:
 		ans.Contents.Value = fmt.Sprintf("template %s defined", sym.name)
+	case protocol.Number:
+		ans.Contents.Value = "number"
+	case protocol.String:
+		ans.Contents.Value = "string"
+	case protocol.Boolean:
+		ans.Contents.Value = "boolean"
 	default:
 		ans.Contents.Value = fmt.Sprintf("oops, sym=%#v", sym)
 	}