git-fetch: update Spanish translation

[k-a-rthik]

2 topical changes to this doc page -

1. Refreshed the outdated ES page for git-fetch. Added the missing git fetch command from EN git-fetch.md into ES doc page.
2. Updated incorrect grammar "Recibe" to "Descarga" which is more appropriate for writing. Recibe is used in context of talking informally.

Cross-referenced with my spanish instructor as well, as I'm learning Git commands this semester in my CS Principles class.

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[Managor]

Fix the rest of the page

[Managor]

Fix the rest of the page first.

[Managor]

Is there a reason for this being a draft?

[k-a-rthik]

Its in draft as I was working out the full changes before enabling for team review.. I am done with the changes and have included fixes for PR comment as well.

[k-a-rthik]

rebased on latest master changes.

[k-a-rthik]

Is there a reason for this being a draft?
was working on last bit of changes and I've set it for review now.

[Managor]

Please do not force push. We like to preserve commit history.

[k-a-rthik]

Please do not force push. We like to preserve commit history.

oh, i dont remember doing a force push, maybe I did a mistake. I just did a rebase from master/head. Is there a different way (git command) you recommend to keep my branch updated?