langref: remove extra curly bracket in the CSS

In commit 3542dbf0ea5 (langref: add section numbers) I accidentally
added an extra closing curly bracket at the end of the style element.

Sorry for not validating the HTML file before creating the PR.
81035b7eb3Manlio Perillo committed on 1/23/2023, 8:51:17 PM· committed by Andrew Kelleyparentce6de2d
1 file changedLine totals unavailable