refactor: adjust spacing and text styling in network feature components

- Reduced NetworkCapabilities description margin from mt-3 to mt-2 and removed text-lg class
- Changed PrimaryFeatures mobile description from color="secondary" to text-gray-200 with mt-2 (note: appears to have typo "mt-" instead of "mt-2")

src/pages/network/PrimaryFeatures.tsx

@@ -369,7 +369,7 @@ function FeaturesMobile() {
                 <MobileFeatureTitle color="white" className="mt-6">
                   {feature.name}
                 </MobileFeatureTitle>
-                <FeatureDescription color="secondary" className="mt-2">
+                <FeatureDescription  className="mt- text-gray-200">
                   {feature.description}
                 </FeatureDescription>
               </div>