[css-grid] Fix heading level

Author: fantasai

css-grid/Overview.bs

@@ -2196,8 +2196,8 @@ Absolutely-positioned Grid Items</h3>
 		but the offsets won't.
 	</div>
 
-<h4 id='auto-placement-algo'>
-Grid Item Placement Algorithm</h4>
+<h3 id='auto-placement-algo'>
+Grid Item Placement Algorithm</h3>
 
 	The following <dfn title="auto-placement algorithm|grid item placement algorithm">grid item placement algorithm</dfn>
 	assigns <i>grid items</i> to <i>grid cells</i>

css-grid/Overview.html

@@ -215,8 +215,7 @@ <h2 class="no-num no-toc no-ref heading settled heading" id=contents><span class
 			<li><a href=#grid-placement-errors><span class=secno>8.2.1</span>  Grid Placement Conflict Handling</a></ul>
 		<li><a href=#placement-shorthands><span class=secno>8.3</span>  Placement Shorthands: the <span class=property data-link-type=propdesc title=grid-column>grid-column</span>, <span class=property data-link-type=propdesc title=grid-row>grid-row</span>, and <span class=property data-link-type=propdesc title=grid-area>grid-area</span> properties</a>
 		<li><a href=#abspos-items><span class=secno>8.4</span>  Absolutely-positioned Grid Items</a>
-			<ul class=toc>
-			<li><a href=#auto-placement-algo><span class=secno>8.4.1</span>  Grid Item Placement Algorithm</a></ul></ul>
+		<li><a href=#auto-placement-algo><span class=secno>8.5</span>  Grid Item Placement Algorithm</a></ul>
 	<li><a href=#alignment><span class=secno>9</span>  Alignment</a>
 		<ul class=toc>
 		<li><a href=#auto-margins><span class=secno>9.1</span>  Aligning with <span data-link-for=margin data-link-type=value title=auto>auto</span> margins</a>
@@ -2250,8 +2249,8 @@ <h3 class="heading settled heading" data-level=8.4 id=abspos-items><span class=s
 		but the offsets won’t.</p>
 	</div>
 
-<h4 class="heading settled heading" data-level=8.4.1 id=auto-placement-algo><span class=secno>8.4.1 </span><span class=content>
-Grid Item Placement Algorithm</span><a class=self-link href=#auto-placement-algo></a></h4>
+<h3 class="heading settled heading" data-level=8.5 id=auto-placement-algo><span class=secno>8.5 </span><span class=content>
+Grid Item Placement Algorithm</span><a class=self-link href=#auto-placement-algo></a></h3>
 
 <p>The following <dfn data-dfn-type=dfn data-noexport="" id=auto-placement-algorithm title="auto-placement algorithm|grid item placement algorithm">grid item placement algorithm<a class=self-link href=#auto-placement-algorithm></a></dfn>
 	assigns <a data-link-type=dfn href=#grid-item title="grid items">grid items</a> to <a data-link-type=dfn href=#grid-cell title="grid cells">grid cells</a>
@@ -3319,8 +3318,8 @@ <h2 class="no-num no-ref heading settled heading" id=index><span class=content>
 <li>automatic row span, <a href=#automatic-grid-span title="section 8">8</a>
 <li>automatic span, <a href=#automatic-grid-span title="section 8">8</a>
 <li>auto-placement, <a href=#auto-placement title="section 6.2">6.2</a>
-<li>auto-placement algorithm, <a href=#auto-placement-algorithm title="section 8.4.1">8.4.1</a>
-<li>auto-placement cursor, <a href=#auto-placement-cursor title="section 8.4.1">8.4.1</a>
+<li>auto-placement algorithm, <a href=#auto-placement-algorithm title="section 8.5">8.5</a>
+<li>auto-placement cursor, <a href=#auto-placement-cursor title="section 8.5">8.5</a>
 <li>available space, <a href=#available-space title="section 10.1">10.1</a>
 <li>base size, <a href=#base-size title="section 10.2">10.2</a>
 <li>column<ul><li>definition of, <a href=#grid-column title="section 2">2</a>
@@ -3363,7 +3362,7 @@ <h2 class="no-num no-ref heading settled heading" id=index><span class=content>
 <li>grid container, <a href=#grid-container title="section 3.1">3.1</a>
 <li>grid formatting context, <a href=#grid-formatting-context title="section 3.1">3.1</a>
 <li>grid item, <a href=#grid-item title="section 4">4</a>
-<li>grid item placement algorithm, <a href=#auto-placement-algorithm title="section 8.4.1">8.4.1</a>
+<li>grid item placement algorithm, <a href=#auto-placement-algorithm title="section 8.5">8.5</a>
 <li>grid layout, <a href=#grid-layout title="section 2">2</a>
 <li>grid line, <a href=#grid-line title="section 2.2">2.2</a>
 <li>&lt;grid-line&gt;, <a href=#typedef-grid-line title="section 8.2">8.2</a>
@@ -3414,7 +3413,7 @@ <h2 class="no-num no-ref heading settled heading" id=index><span class=content>
 <li>value for grid-template-areas, <a href=#valdef-grid-template-areas.none title="section 5.2">5.2</a>
 <li>value for grid-template, <a href=#valdef-grid-template.none title="section 5.3">5.3</a>
 </ul><li>null cell token, <a href=#null-cell-token title="section 5.2">5.2</a>
-<li>occupied grid cell, <a href=#occupied-grid-cell title="section 8.4.1">8.4.1</a>
+<li>occupied grid cell, <a href=#occupied-grid-cell title="section 8.5">8.5</a>
 <li>order-modified grid order, <a href=#order-modified-grid-order title="section 9.6">9.6</a>
 <li>overgrowable tracks, <a href=#overgrowable-tracks title="section Unnumbered section">Unnumbered section</a>
 <li>participates in baseline alignment, <a href=#baseline-participation title="section 9.6">9.6</a>