ENGCOM-8207: #1832: Rename renditions stores config fieldset and add comments #30044

 - Merge Pull Request #30044 from joweecaquicla/magento2:ASI-1832-rename-renditions-stores-config-fieldset-and-add-comments
 - Merged commits:
   1. 45a224f
   2. dd347f5
   3. ee98337

Author: magento-engcom-team

app/code/Magento/MediaGalleryRenditions/etc/adminhtml/system.xml

@@ -9,14 +9,18 @@
     <system>
         <section id="system">
             <group id="media_gallery_renditions" translate="label" type="text" sortOrder="1010" showInDefault="1" showInWebsite="0" showInStore="0">
-                <label>Media Gallery Renditions</label>
+                <label>Media Gallery Image Optimization</label>
+                <comment>Resize images to improve performance and decrease the file size. When you use an image from Media Gallery on the storefront, the smaller image is generated and placed instead of the original.
+                    Changing these settings will update all generated images.</comment>
                 <field id="width" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0" showInStore="0">
-                    <label>Max Width</label>
+                    <label>Maximum Width</label>
                     <validate>validate-zero-or-greater validate-digits</validate>
+                    <comment>Enter the maximum width of an image in pixels.</comment>
                 </field>
                 <field id="height" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="0" showInStore="0">
-                    <label>Max Height</label>
+                    <label>Maximum Height</label>
                     <validate>validate-zero-or-greater validate-digits</validate>
+                    <comment>Enter the maximum height of an image in pixels.</comment>
                 </field>
             </group>
         </section>