[Focus Mode] Update doc and screenshots in Storage

[yanlingwang23]

Update the screenshots in the following articles:

• cookies
• cache

[captainbrosset]

Ideally we'd draw red boxes on pretty much all of these screenshots, to attract the reader's attention to the right places. But seeing how none of the old screenshots had these boxes either, I'm approving this PR. It's a good first step, and we can improve the images in a follow-up PR.
Thanks!

[learn-build-service-prod]

Learn Build status updates of commit 17481f0:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/devtools-guide-chromium/storage/cache.md	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-delete-selected.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-domain-js-preview.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-domain-refresh.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-domain-root-headers.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-filter.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-cache-storage-index-headers.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-clear-storage-cache-storage-checkbox.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-clear-storage-cache-storage-checkbox-clear-site-data-button.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cache-images/storage-application-manifest.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies.md	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/clear-all-cookies.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/delete-selected-cookie.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/filter-cookies-name.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/open-cookies-select-source.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/pick-application-no-manifest.png	✅Succeeded	View
microsoft-edge/devtools-guide-chromium/storage/cookies-images/rename-cookie.png	✅Succeeded	View

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[captainbrosset]

Ideally we'd draw red boxes on pretty much all of these screenshots, to attract the reader's attention to the right places. But seeing how none of the old screenshots had these boxes either, I'm approving this PR. It's a good first step, and we can improve the images in a follow-up PR.

Now addressed in PR #2724.