Switch access permissions from write to read on vulnerability alerts GET endpoint (github#28409)

Author: Fredrick-Tam

content/rest/overview/permissions-required-for-github-apps.md

@@ -185,7 +185,7 @@ _Search_
 - [`PUT /repos/:owner/:repo/topics`](/rest/reference/repos#replace-all-repository-topics) (:write)
 - [`POST /repos/:owner/:repo/transfer`](/rest/reference/repos#transfer-a-repository) (:write)
 {% ifversion fpt or ghec -%}
-- [`GET /repos/:owner/:repo/vulnerability-alerts`](/rest/reference/repos#enable-vulnerability-alerts) (:write)
+- [`GET /repos/:owner/:repo/vulnerability-alerts`](/rest/reference/repos#enable-vulnerability-alerts) (:read)
 {% endif -%}
 {% ifversion fpt or ghec -%}
 - [`PUT /repos/:owner/:repo/vulnerability-alerts`](/rest/reference/repos#enable-vulnerability-alerts) (:write)