Wikipedia:Manual of Style/Linking
An overlinked article contains an excessive number of links, making it difficult to identify links likely to aid the reader’s understanding significantly.
.. An article is said to be underlinked if words are not linked that are needed to aid understanding of the article.
.. The article linked to should correspond to the term showing as the link as closely as possible given the context: for example, When Mozart wrote his Requiem rather than When Mozart wrote his Requiem, or Previn conducted Mozart’s Requiem rather than Previn conducted Mozart’s Requiem – this makes it clear the link is to the article on Mozart’s Requiem in particular, rather than that on requiems in general.