Rules: Post-migration fixes (#3707)

content/rules/_index.md

.../rules/_partials/transform/_header-modification-fields.md

content/rules/_partials/transform/_transform-phase-fields.md

content/rules/bulk-redirects/concepts.md

content/rules/bulk-redirects/create-api.md

content/rules/bulk-redirects/how-it-works.md

content/rules/bulk-redirects/reference/fields-functions.md

content/rules/bulk-redirects/reference/parameters.md

content/rules/transform/_index.md

...rules/transform/request-header-modification/create-api.md

...transform/request-header-modification/create-dashboard.md

...request-header-modification/reference/fields-functions.md

...ules/transform/response-header-modification/create-api.md

...ransform/response-header-modification/create-dashboard.md

...esponse-header-modification/reference/fields-functions.md

content/rules/transform/url-rewrite/create-api.md

content/rules/transform/url-rewrite/create-dashboard.md

...rules/transform/url-rewrite/reference/fields-functions.md