Add more code examples to webpages

[williamwen42]

We should make a coordinated effort to add code examples to a significant number of webpages that demonstrate:

• How the graph break is triggered
• A code-rewrite example to avoid the graph break

Some existing webpages also need to be audited, for example, this workaround https://meta-pytorch.org/compile-graph-break-site/gb/gb0007.html doesn't make sense.