[docs] Change headings

Author: elgopher

Diff for: examples/README.md

@@ -1,9 +1,9 @@
-# Run example locally
+## Run example locally
 
 * cd into directory, for example `cd hello`
 * `go run .`
 
-# Run example without cloning the Pi source code
+## Run example without cloning the Pi source code
 
 * `go run github.com/elgopher/pi/examples/hello@latest`