[css-grid] fix linking errors

Author: tabatkins

css-grid-1/Overview.bs

@@ -33,6 +33,7 @@ At Risk: application of grid placement to absolutely-positioned boxes
 spec:css-align-3;
 	type:value;
 		text:stretch; for:align-self
+		text:stretch; for:align-content
 		text:space-between; for:justify-content
 		text:space-around; for:justify-content
 	type:property; text:column-gap
@@ -4250,7 +4251,7 @@ Major Changes</h4>
 			(vs. <a href="https://www.w3.org/TR/2016/CR-css-grid-1-20160929/#grid-item-sizing">original</a>).
 
 		<li id="change-2016-auto-percent-track">
-			Changed the behavior of <<pecentage>> tracks
+			Changed the behavior of <<percentage>> tracks
 			inside a <a>grid container</a> whose size depends on the size of those tracks
 			to match implementations by
 			contributing their dimensions sized as ''grid-template-columns/auto''
@@ -4264,7 +4265,7 @@ Major Changes</h4>
 			the <a>grid container</a>
 			and in the contents of tracks overflowing the tracks
 			when <<percentage>> sizes are used
-			in <a>fit-content</a>-sized <a>grid containers</a>
+			in <a lt="fit-content size">fit-content</a>-sized <a>grid containers</a>
 			such as ''width/auto''-sized inline or floated <a>grid containers</a>.
 			(To avoid this problem, use <<flex>> units instead,
 			which are intended to maintain their ratios and not overflow