[css-align] Remove stray character.

Author: dbaron

css-align/Overview.bs

@@ -403,7 +403,7 @@ Baseline Alignment: the ''baseline'' keyword and ''first''/''last'' modifiers</h
 			See [[#align-by-baseline]] for more details.
 
 			The <a>fallback alignment</a> for ''last baseline'' is ''end''.
-1	</dl>
+	</dl>
 
 	When specified for 'align-content',
 	these values trigger <a>baseline content-alignment</a>,