Improve wording clarity in Image block placeholder text

[Ashok-A15]

This PR updates the wording of the Image block placeholder text for improved readability.

Changed:
"upload" → "upload it"

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[Mamaduka]

Thanks for the PR, @Ashok-A15! I don't see an associated issue. Was it discussed anywhere?

I'm not a native English speaker, but I don't think "it" changes anything. IMO, these instructions list available actions and in that context, the "upload" string makes sense.

Additionally, similar string are also present in packages/block-editor/src/components/media-placeholder/index.js.

@ramonjd, can I get a second opinion on my English? :)

[ramonjd]

I only speak Australian!

I don't see much value in adding "it" here. If we were talking about a specific image, like cat.gif then it would make more sense as an object in the sentence.

Like - you have cat.gif, you can drag and drop it, or upload it.

But here it's general instructional/hint text and I think not worth the extra translation effort required. If other locales need the object here, they would have added it already. English (and Australian!) doesn't in my opinion.