Fix heading increment

.markdownlint.jsonc

@@ -5,7 +5,7 @@
 {
   "default": true,
   // Disabled, as some callouts include headings.
-  "header-increment": false,
+  "heading-increment": false,
   "ul-style": {
     "style": "dash"
   },

files/en-us/web/api/cssfontpalettevaluesrule/name/index.md

@@ -16,7 +16,7 @@ A string beginning with two dashes.
 
 ## Examples
 
-## Read the at-rule's name
+### Read the at-rule's name
 
 This example first defines an {{cssxref("@import")}} and an {{cssxref("@font-palette-values")}} at-rule. Then it reads the {{cssxref("@font-palette-values")}} rule and displays its name. As these rules live in the last stylesheet added to the document, the palette will be the second {{domxref("CSSRule")}} returned by the last stylesheet in the document (`document.styleSheets[document.styleSheets.length-1].cssRules`). So, `rules[1]` returns a {{domxref("CSSFontPaletteValuesRule")}} object, from which we can access `name`.
 

files/en-us/web/api/gpurenderbundleencoder/setbindgroup/index.md

@@ -24,7 +24,7 @@ setBindGroup(index, bindGroup, dynamicOffsets, dynamicOffsetsStart,
              dynamicOffsetsLength)
 ```
 
-#### Parameters
+### Parameters
 
 - `index`
   - : The index to set the bind group at. This matches the `n` index value of the corresponding [`@group(n)`](https://gpuweb.github.io/gpuweb/wgsl/#attribute-group) attribute in the shader code ({{domxref("GPUShaderModule")}}) used in the related pipeline.

files/en-us/web/css/@page/index.md

@@ -195,7 +195,7 @@ Other margin-at rules include:
 @right-bottom
 ```
 
-#### Page-margin properties
+### Page-margin properties
 
 The page-margin properties are the set of CSS properties can be set in any individual margin at-rule. They include:
 

files/en-us/web/css/timeline-scope/index.md

@@ -48,7 +48,7 @@ Allowed values for `timeline-scope` are:
 
 In this example, a scroll timeline named `--myScroller` is defined using the `scroll-timeline-name` property on the element with the `scroller` class (the scrolling element). This is then applied to the animation on the element with the `box` and `animation` classes (the animated element) using `animation-timeline: --myScroller`. The key point to note here is that the animated element is not a descendant of the scrolling element — to make this work, we increase the scope of the `--myScroller` timeline by setting `timeline-scope: --myScroller` on the {{htmlelement("body")}}.
 
-#### HTML
+### HTML
 
 The HTML for the example is shown below.
 
@@ -62,7 +62,7 @@ The HTML for the example is shown below.
 </div>
 ```
 
-#### CSS
+### CSS
 
 The CSS is as follows.
 
@@ -130,7 +130,7 @@ Next, we give the animated element some rudimentary styling, and apply an animat
 }
 ```
 
-#### Result
+### Result
 
 Scroll the vertical bar on the pink area to see the square animate.
 

files/en-us/web/progressive_web_apps/tutorials/cycletracker/manifest_file/index.md

@@ -215,13 +215,13 @@ The `<link>` element is most commonly used to link to stylesheets and, with PWAs
 
 When using the `.webmanifest` extension, set `type="application/manifest+json"` if your server doesn't support that MIME type.
 
-#### Task
+### Task
 
 Save the manifest file that you have created in the steps above, then link to it from the `index.html` file.
 
 Optionally, link to a shortcut icon from your HTML as well.
 
-#### Example solution
+### Example solution
 
 The {{HTMLelement("head")}} of `index.html` may now look similar to: