[css-align] fix link

Author: tabatkins

css-align/Overview.bs

@@ -357,7 +357,7 @@ Baseline Alignment: the ''baseline'' keyword and ''first''/''last'' modifiers</h
 	by matching up their <a>alignment baselines</a>.
 	If the position of the <a>alignment subjects</a> within a <a>baseline-sharing group</a>
 	is not fully constrained by <a>baseline alignment</a>
-	(i.e., they could be shifted within their respective <a>aligment containers</a>
+	(i.e., they could be shifted within their respective <a>alignment containers</a>
 	while maintaining baseline-alignment),
 	they are [=fallback alignment|fallback-aligned=] insofar as possible while preserving their <a>baseline alignment</a>.