Update manifest files docs

[Viper]

Hi!
I've found a strange behavior when the link attribute of a <menu> tag contain an ampersand. Installer won't copy the language files from package.

Example:
Wrong link like this:

<menu link="option=com_component&type=abc">COM_MENU_0</menu>

should be

<menu link="option=com_component&amp;type=abc">COM_MENU_0</menu>

I think we need to update documentation in https://docs.joomla.org/Manifest_files#Menu_links_and_submenus section.

[Michael Babker]

There are already comments stating something similar in manifests for core components - https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_banners/banners.xml#L33

As it's a wiki, feel free to add a note to the page.

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[Viper]

Fixed in wiki.