Error messages
Every message names the page and the line it is about. This page exists partly to be linked to: its filename contains a space, which is the case that makes link spelling matter — see Writing pages.
A link points at nothing published
guide/install.md:12 link to "../reference/exit-code.md" — no such page
The path is reported as written, resolved against the document holding it. If the destination
stops at a space, the message says that instead of naming the truncated path — an unbracketed
destination ends at the first space, so [x](../a b/c.md) links ../a and leaves the rest as
text, and the target a message would otherwise name is one nobody wrote.
A wikilink matches nothing
guide/writing/index.md:31 wikilink [[instal]] matches no page
Reported separately because an unresolved wikilink renders as plain text rather than as a broken link. Nothing on the published page looks wrong, so without the message nobody knows to look.
An image is not a published file
index.md:4 image "assets/diagram.png" is not a published file
"Not published" covers three cases at once: the file does not exist, it is excluded, or it sits above the site root. All three end the same way for a reader.
A page is placed twice
settings.sections[0].items[3]: "guide/install" is placed more than once
A settings error rather than a content one, so it names the position in the file. A section's own
index page is not counted here — the section heading already links it, so naming it in items
asks for what is there rather than for a second copy.
Warnings
2 page(s) no section covers: reference/exit-codes.md, reference/error messages.md
exclude "_archive" matched nothing
32 page(s) checked, nothing broken, 22 warning(s)
The last line is the summary. It carries the warning count so "nothing broken" cannot be read as "nothing to look at".