Fix grammatical error in attr-value-double-quotes rule documentation (#1755)

* Initial plan

* Fix grammatical error: change "must closed" to "must be closed"

Co-authored-by: coliff <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: coliff <[email protected]>

Author: Copilot

test/cli/formatters/sarif.sarif

@@ -15,7 +15,7 @@
               "helpUri": "https://htmlhint.com/rules/attr-value-double-quotes",
               "help": {
                 "text": "Attribute values must be in double quotes.",
-                "markdown": "\nAttribute value must closed by double quotes.\n\nLevel: Error\n\n## Config value\n\n- `true`: enable rule\n- `false`: disable rule\n\n### The following patterns are **not** considered rule violations\n\n```html\n`<a href=\"\" title=\"abc\">``</a>`\n```\n\n### The following pattern is considered a rule violation:\n\n```html\n`<a href='' title='abc'>``</a>`\n```"
+                "markdown": "\nAttribute value must be closed by double quotes.\n\nLevel: Error\n\n## Config value\n\n- `true`: enable rule\n- `false`: disable rule\n\n### The following patterns are **not** considered rule violations\n\n```html\n`<a href=\"\" title=\"abc\">``</a>`\n```\n\n### The following pattern is considered a rule violation:\n\n```html\n`<a href='' title='abc'>``</a>`\n```"
               }
             },
             {

website/src/content/docs/rules/attr-value-double-quotes.mdx

@@ -6,7 +6,7 @@ description: Requires attribute values in HTML to be enclosed in double quotes f
 
 import { Badge } from '@astrojs/starlight/components';
 
-Attribute value must closed by double quotes.
+Attribute value must be closed by double quotes.
 
 Level: <Badge text="Error" variant="danger" />