documentation: Fix internal link
Fix the internal links to the section "Manually Generating the Help
Message". Note that this style of adding the HTML anchor in the Markdown
file is already used within the same document.
@@ -508,6 +508,8 @@ This can be useful, if you are writing a custom configuration tool (like the sta
Such tools normally don't need (or want) to be configured via persistent config files, but often have an advanced command-line interface.
Using the fairly feature-rich parser implemented in `elektraGetOpts` could be a good option here.
+<a id="manual-help-message"></a>
+
## Advanced Use: Manually Generating the Help Message
When using `gopts` you automatically get a generated help message via the key `proc:/elektra/gopts/help/message`, whenever the `--help` option is used.
