Fix broken Markdown headings in examples/gotutorial.md (#1189)

diff --git a/examples/gotutorial.md b/examples/gotutorial.md
index 6770b52..a86b5b6 100644
--- a/examples/gotutorial.md
+++ b/examples/gotutorial.md
@@ -1,4 +1,4 @@
-#gRPC Basics: Go
+# gRPC Basics: Go
 
 This tutorial provides a basic Go programmer's introduction to working with gRPC. By walking through this example you'll learn how to: