use heading tag for examples header

Author: khiga8

docs/rules/accessibility/avoid-both-disabled-and-aria-disabled.md

@@ -9,14 +9,14 @@ HTML elements with `disabled` are ignored when a screen reader uses tab navigati
 
 This linter will raise when both `aria-disabled` and `disabled` are set on HTML elements that natively support `disabled` including `button`, `fieldset`, `input`, `optgroup`, `option`, `select`, and `textarea`.
 
-👎 Examples of **incorrect** code for this rule:
+### 👎 Examples of **incorrect** code for this rule:
 
 ```erb
 <button aria-disabled="true" disabled="true">
 <input aria-disabled="true" disabled="true">
 ```
 
-👍 Examples of **correct** code for this rule:
+### 👍 Examples of **correct** code for this rule:
 
 ```erb
 <button disabled="true">

docs/rules/accessibility/iframe-has-title.md

@@ -4,13 +4,13 @@
 
 `<iframe>` should have a unique title attribute that identifies the content. The title will help screen reader users determine whether to explore the frame in detail. If an `<iframe>` contains no meaningful content, hide it by setting `aria-hidden="true"`.
 
-👎 Examples of **incorrect** code for this rule:
+### 👎 Examples of **incorrect** code for this rule:
 
 ```erb
 <iframe src="../welcome-video"></iframe>
 ```
 
-👍 Examples of **correct** code for this rule:
+### 👍 Examples of **correct** code for this rule:
 
 ```erb
 <!-- good -->

docs/rules/accessibility/image-has-alt.md

@@ -6,13 +6,13 @@
 
 Learn more at [W3C WAI Images Tutorial](https://www.w3.org/WAI/tutorials/images/).
 
-👎 Examples of **incorrect** code for this rule:
+### 👎 Examples of **incorrect** code for this rule:
 
 ```erb
 <img src="logo.png">
 ```
 
-👍 Examples of **correct** code for this rule:
+### 👍 Examples of **correct** code for this rule:
 
 ```erb
 <!-- good -->

docs/rules/accessibility/no-aria-label-misuse.md

@@ -12,7 +12,7 @@ Also check out the following resources:
 - [w3c/aria Consider prohibiting author naming certain roles #833](https://github.com/w3c/aria/issues/833)
 - [Not so short note on aria-label usage - Big Table Edition](https://html5accessibility.com/stuff/2020/11/07/not-so-short-note-on-aria-label-usage-big-table-edition/)
 
-👎 Examples of **incorrect** code for this rule:
+### 👎 Examples of **incorrect** code for this rule:
 
 ```erb
 <span aria-label="This does something">Hello</span>
@@ -26,7 +26,7 @@ Also check out the following resources:
 <h1 aria-label="This will override the content">Page title</h1>
 ```
 
-👍 Examples of **correct** code for this rule:
+### 👍 Examples of **correct** code for this rule:
 
 ```erb
 <span>Hello</span>

docs/rules/accessibility/no-redundant-image-alt.md

@@ -6,13 +6,13 @@
 
 Learn more at [W3C WAI Images Tutorial](https://www.w3.org/WAI/tutorials/images/).
 
-👎 Examples of **incorrect** code for this rule:
+### 👎 Examples of **incorrect** code for this rule:
 
 ```erb
 <img alt="picture of Mona Lisa" src="monalisa.png">
 ```
 
-👍 Examples of **correct** code for this rule:
+### 👍 Examples of **correct** code for this rule:
 
 ```erb
 <!-- good -->