Remove erroneous `img` closing tag
Author: xenova
Pull request: yes

# What does this PR do?

Removes erroneous closing tag for the "support" image tag for the Portuguese documentation (https://huggingface.co/docs/transformers/v4.29.1/pt/index)

Currently, there is an extra "&lt;/img>" after the image, which is causing issues with doc-builder
![image](https://github.com/huggingface/transformers/assets/26504141/702fd817-b626-4f93-86d4-113bcb823328)


<!-- Remove if not applicable -->

Fixes issue in https://github.com/huggingface/transformers/pull/23625. Doc builder logs:
```bash
[vite-plugin-svelte] /tmp/tmpem9ikhqv/kit/src/routes/index.mdx:93:241 <img> is a void element and cannot have children, or a closing tag
file: /tmp/tmpem9ikhqv/kit/src/routes/index.mdx:93:241
 91 |  
 92 |  <a target="_blank" href="https://huggingface.co/support">
 93 |      <img alt="HuggingFace Expert Acceleration Program" src="https://huggingface.co/front/thumbnails/support.png" style="width: 100%; max-width: 600px; border: 1px solid #eee; border-radius: 4px; box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);"></img>
                                                                                                                                                                                                                                                        ^
 94 |  </a>
 95 |  <h2 class="relative group">
> /tmp/tmpem9ikhqv/kit/src/routes/index.mdx:93:241 <img> is a void element and cannot have children, or a closing tag
    at error (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:17691:19)
    at Parser$1.error (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:17767:9)
    at tag (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:16765:20)
    at new Parser$1 (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:17726:21)
    at parse$3 (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:17858:20)
    at compile (file:///tmp/tmpem9ikhqv/kit/node_modules/svelte/compiler.mjs:31871:17)
    at compileSvelte2 (file:///tmp/tmpem9ikhqv/kit/node_modules/@sveltejs/vite-plugin-svelte/dist/index.js:319:20)
    at async Object.transform (file:///tmp/tmpem9ikhqv/kit/node_modules/@sveltejs/vite-plugin-svelte/dist/index.js:1602:23)
    at async transform (/tmp/tmpem9ikhqv/kit/node_modules/rollup/dist/shared/rollup.js:21965:16)
    at async ModuleLoader.addModuleSource (/tmp/tmpem9ikhqv/kit/node_modules/rollup/dist/shared/rollup.js:22191:30)
```


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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      to it if that's the case.
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      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


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