When an absolute link is missing the leading slash (it starts with
"docs/foo" instead of "/docs/foo/"), print a more specific error instead
of the generic catch-all warning.
Without the leading slash, these are treated as relative paths and so
lead to non-existing pages.
Also, while we're at it, fix the instance it detects.
The linkchecker script is not working the same way as the `scripts/lsync.sh`.
- The path must start with '/docs'. This is not implied in any way.
- The language can be deduced if user provides a full path to a markdown
file, e.g. `content/en/docs/concepts/security/controlling-access.md`.
- The path parameter could use a positional argument for ease of use.
This PR improves the user experience for the tool.
Miguel Garcia
howieyuen
Qiming Teng
Philippe Martin
TAKAHASHI Shuuji
Qiming Teng