Fix docstring typo.
Fix docstring typo.

algernon/elfeed,emacsmirror/elfeed,seblemaguer/elfeed,daimrod/elfeed,algernon/elfeed,emacsmirror/elfeed,skeeto/elfeed,skeeto/elfeed,holomorph/elfeed,seblemaguer/elfeed,holomorph/elfeed,jinnovation/elfeed,jinnovation/elfeed,abo-abo/elfeed,daimrod/elfeed