I have updated the capistrano docs so that the indentations are all
correct and align with the numbers correctly.
This one, if wanting to pout backticks round the code whilst indented,
doesn't render properly. Has to be double indented.
Fixes#17633.
The "subdomain" label is redundant, to the extent it's even
accurate -- this is really just the URL we want to display,
which may or may not involve a subdomain. Similarly "external".
The former `external_api_path_subdomain` was never a path -- it's a
host, followed by a path, which together form a scheme-relative URL.
I'm not quite convinced that value is actually the right thing in
2 of the 3 places we use it, but fixing that can start by giving an
accurate name to the thing we have.