[css-grid] Widen the headings to actually describe what's happening in the sections.

Author: tabatkins

css-grid/Overview.bs

@@ -2716,7 +2716,7 @@ Resolve Content-Based Track Sizing Functions</h3>
 			that do not span a track with a <i>flexible sizing function</i>:
 			<ol>
 				<li>
-					<strong>For min-content minimums:</strong>
+					<strong>For intrinsic minimums:</strong>
 					First increase the <i>base size</i> of tracks with
 					a <i>min track sizing function</i> of ''min-content'' or ''max-content''
 					by <a href="#extra-space">distributing extra space</a> as needed
@@ -2728,7 +2728,7 @@ Resolve Content-Based Track Sizing Functions</h3>
 					by <a href="#extra-space">distributing extra space</a> as needed
 					to account for these items' <i>max-content contributions</i>.
 				<li>
-					<strong>For min-content maximums:</strong>
+					<strong>For intrinsic maximums:</strong>
 					Third increase the <i>growth limit</i> of tracks with
 					a <i>max track sizing function</i> of ''min-content'' or ''max-content''
 					by <a href="#extra-space">distributing extra space</a> as needed

css-grid/Overview.html

@@ -2768,7 +2768,7 @@ <h3 class="heading settled heading" data-level=10.4 id=algo-content><span class=
 			that do not span a track with a <a data-link-type=dfn href=#flexible-sizing-function title="flexible sizing function">flexible sizing function</a>:
 			<ol>
 				<li>
-					<strong>For min-content minimums:</strong>
+					<strong>For intrinsic minimums:</strong>
 					First increase the <a data-link-type=dfn href=#base-size title="base size">base size</a> of tracks with
 					a <a data-link-type=dfn href=#min-track-sizing-function title="min track sizing function">min track sizing function</a> of <a class=css data-link-type=maybe href=#valuedef-min-content title=min-content>min-content</a> or <a class=css data-link-type=maybe href=#valuedef-max-content title=max-content>max-content</a>
 					by <a href=#extra-space>distributing extra space</a> as needed
@@ -2780,7 +2780,7 @@ <h3 class="heading settled heading" data-level=10.4 id=algo-content><span class=
 					by <a href=#extra-space>distributing extra space</a> as needed
 					to account for these items' <a data-link-type=dfn href=http://dev.w3.org/csswg/css-sizing-3/#max-content-contribution title="max-content contributions">max-content contributions</a>.
 				<li>
-					<strong>For min-content maximums:</strong>
+					<strong>For intrinsic maximums:</strong>
 					Third increase the <a data-link-type=dfn href=#growth-limit title="growth limit">growth limit</a> of tracks with
 					a <a data-link-type=dfn href=#max-track-sizing-function title="max track sizing function">max track sizing function</a> of <a class=css data-link-type=maybe href=#valuedef-min-content title=min-content>min-content</a> or <a class=css data-link-type=maybe href=#valuedef-max-content title=max-content>max-content</a>
 					by <a href=#extra-space>distributing extra space</a> as needed