Fix section=>block in CMS block documentation (#2058)

* Fix section=>block in CMS block documentation

This showed `section` in the path instead of `block`.

* Update guides/plugins/plugins/content/cms/add-cms-block.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update CMS block filename and loader path details

Clarified the file naming convention for CMS block components and updated the loader path.

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Su <112690947+sushmangupta@users.noreply.github.com>

Author: 3 people

guides/plugins/plugins/content/cms/add-cms-block.md

@@ -159,9 +159,7 @@ The Storefront template defines how your element appears on the actual storefron
 * **Technical name**: `image-text-reversed` (The `name` property in Step 2)
 * **Extension**: `.html.twig`
 
-**Shopware is expecting the prefix as part of the full filename in `src/Storefront/Resources/views/storefront/section/cms-section-block-container.html.twig`.**
-
-Full example: `cms-block-image-text-reversed.html.twig`
+The block components are loaded in `src/Storefront/Resources/views/storefront/section/cms-section-block-container.html.twig`. This loader expects the following format for block components: `cms-block-image-text-reversed.html.twig`.
 
 ### Basic Template