Fix spanish translation typo

[Nullpo]

Changes proposed in this pull request:

• Replaced the word "pain" to "paint" in the spanish version of https://web.dev/i18n/es/lcp/ article.

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Requested changes

If there are any common problems with the content files you created or modified, they will be listed here.

src/site/content/es/metrics/lcp/index.md

• Please change your usage of the following words:
  • Do not use master. Affected lines: 77, 125, 172

[sofiayem]

@Nullpo Thank you for your contribution! Please visit https://cla.developers.google.com/ and sign it so I can merge your PR. Once you've signed, follow the "New Contributors" link at the bottom of this page to update the corresponding check.

[malchata]

As @sofiayem said, we'll need you to sign the CLA before we can merge @Nullpo.

[miguelfdezc]

Hi @Nullpo! Are you still working on this fix?

If not, I'm willing to take over and create an issue and PR to fix the translation typo so we can improve the documentation

@sofiayem @malchata waiting for your response to make my contribution