[css-grid-2] Fix linking.

Author: fantasai

css-grid-1/Overview.bs

@@ -2662,7 +2662,8 @@ Placing Grid Items</h2>
 		<dt><dfn export local-lt="span|row span|column span">grid span</dfn>
 		<dd>
 			How many <a>grid tracks</a> the <a>grid item</a> occupies in each axis.
-			A <a>grid item</a>’s <a>grid span</a> is always <dfn export lt="definite grid span|definite row span|definite column span|definite span">definite</dfn>,
+			In Level 1,
+			a <a>grid item</a>’s <a>grid span</a> is always <dfn export lt="definite grid span|definite row span|definite column span|definite span">definite</dfn>,
 			defaulting to 1 in each axis if it can't be otherwise determined for that axis.
 	</dl>
 

css-grid-2/Overview.bs

@@ -119,7 +119,8 @@ Establishing a Subgrid</h3>
 
 			The <<line-name-list>> argument allows local naming of the grid lines propagated from the parent grid:
 			if a <<line-name-list>> is given,
-			the specified <<line-names>>s are assigned to the subgrid’s <a>explicit grid lines</a>,
+			the specified <<line-names>>s are assigned to
+			the lines of the subgrid’s <a>explicit grid</a>,
 			one per line, starting with line 1.
 			Excess <<line-names>> are ignored.
 
@@ -176,7 +177,7 @@ Characteristics of a Subgrid Item</h3>
 					(regardless of its 'grid-template-*' properties).
 
 				<li>
-					If it has an <a>indefinite grid span</a>
+					If it has an <dfn>indefinite grid span</dfn>
 					(i.e. either the '*-start' or '*-end' value
 					of its <a>grid-placement properties</a> in the subgridded axis
 					is ''grid-row-start/auto'')