[docs] Remove ` around @default values

[alexfauquette]

We have the two way of defining default that exist:

@default `false`
@default false

The docs currently support the second one. Otherwise you get the following rendering in API pages

https://mui.com/x/api/date-pickers/multi-input-date-range-field/#multi-input-date-range-field-prop-shouldRespectLeadingZeros

Better to wait for #41069 to avoid issues with the MD file generation used by data grid interfaces

To post in slack when merging

Hi, Just a head up about docs API
The @default JSDocs already expect some code. So it's unnecessary to add ` around the default value. Otherwise the ` will be rendered in the API

[mui-bot]

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[flaviendelangle]

Do you think we could even throw during the build step if a default starts and ends with the ` char?

[alexfauquette]

Do you think we could even throw during the build step if a default starts and ends with the ` char?

The issue is that it can make sense, for example * @default `${adapter.formats.month} ${adapter.formats.year}`

[flaviendelangle]

"start with , ends with and do not contain any ${} pattern" 😆

The idea is just that if we can catch most bad usages of `, even if it's not 100%, it will make is easier to keep consistency
But feel free to ignore my comment if you think it's not worth it / if it adds to much complexity

[alexfauquette]

@flaviendelangle I gave it a try by logging warning in the docs:api but it's lost with all the other lines displayed in the console. And I do't feel motivated enough to start creating an eslint rule :)