Fix title level of check command
@@ -103,7 +103,7 @@ $ zola --config config.staging.toml serve
By default, drafts are not loaded. If you wish to include them, pass the `--drafts` flag.
-### check
+## check
The check subcommand will try to build all pages just like the build command would, but without writing any of the
results to disk. Additionally, it will also check all external links in Markdown files by trying to fetch
