docs(TextInput): update documentation + stories

[cf-remylenoir]

Purpose of PR

This work takes care of updating our Documentation and Storybook based on the latest API changes.

Documentation

• Example of using an icon
• Example with different sizes

Storybook

• Addition of the icon and group examples to the Overview

PR Checklist

• I have read the relevant readme.md file(s)
• All commits follow our Git commit message convention
• Tests are added/updated/not required
• Tests are passing
• Storybook stories are added/updated/not required
• Usage notes are added/updated/not required
• Has been tested based on Contentful's browser support
• Doesn't contain any sensitive information

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Latest commit: 8b32755

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Name	Status	Preview	Updated (UTC)
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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	129.58 KB (0%)	2.6 s (0%)	136 ms (+103% 🔺)	2.8 s
Module	126.04 KB (0%)	2.6 s (0%)	103 ms (+6.8% 🔺)	2.7 s

[damann]

Sorry, this is really, really nit-picky. The punctuation with the comma seems a bit off. _"It is possible …, it will be rendered …" I want to make sure we

Can you please change it to something like:
It is possible to provide an icon to the TextInput, and it will be displayed on the left-hand side of the input. or
It is possible to provide an icon to the TextInput. It will be displayed on the left-hand side of the input.

I'm also not sure if we need the "Example of usage:" That should be obvious.

Other than that, it's all good. Thanks!