The links to the http-server and http-client samples were pointing to a url
with an unresolved `{branch}` attribute.
Replace the links by instead using the attributes `{samples_code}` and
`{standalone_samples_path}`.
The links to the http-server and http-client samples were pointing to a url
with an unresolved `{branch}` attribute.
Replace the links by instead using the attributes `{samples_code}` and
`{standalone_samples_path}`.