[core] Batch small changes

[oliviertassinari]

• [docs] Fix typo https://codeSandbox.io f61df45: the upper case in the URL doesn't make sense.
• [docs] Fix git diff format 0716179. Before:

After:

• no need to compute displayName in production cf1698c: I have noticed the opportunity in [system] Compute display name of styled component if name isn't set #27401. I push it one step further.
• [examples] Fix codesandbox links to match the installation instructions cc30191: the installation instructions point to a specific branch so that we can work on two different versions. I have updated the codesandbox link to be consistent.
• [docs] Remove space before : b7c95a8. It was introduced in [docs] Update Transitions page #27319. cc @siriwatknp
• [docs] Header convention 593889f: It was introduced in [docs] Make migration doc easier to follow #26948.
• clarifies a bit more this rule 46e53f9. We had a chat in the X team about how we should name booleans. I have realized that this documentation didn't mention a second advantage of the rule.
• [docs] Link Sparkline from third-party 6b71e0e. By @Janpot
• [docs] Link our docs, not a third-party project 87b1cbb. This is a follow-up on [docs] Use actual link to paperbase #27063. We have no affiliations with https://docs.paperbase.app/. cc @eps1lon

[mui-pr-bot]

Details of bundle changes (experimental)

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[eps1lon]

We have no affiliations with docs.paperbase.app. cc @eps1lon

Other than copying their layout of course lol.

[oliviertassinari]

Other than copying their layout of course lol.

@eps1lon What do you mean? To be clear, Paperbase is meant as a clone of Firebase. For instance, https://console.firebase.google.com/project/react-swipeable-views-395e4/overview: