updated Renaming Index section to use file name in parens instead of …

[klequis]

According to the latest docs for SolidStart > Routing Renaming Index, to rename the index file for a route you give the route the same name as the folder. This does not work:

• socials
  • socials.tsx

According to the older doc, which I can no longer find, to rename the index file for a route you enclose file name in parens. This works:

• socials
  • (socials).tsx

Here is an example that illustrates these points: renaming-index-issue722-example

In the example I changed the /blog route to use the file I changed the /blog route to use the file name in parens:

• blog
  • (blog).jsx`

If you run the example:

• clicking on the "Blog" button routes to the blog page
• clicking on the "Socials" button routes to the 404 Not Found page

This pull request updates the docs to use the "file name in parens" method for renaming the index file.

Note on code highlighting

I wasn't completely sure what highlighting lines under /blog and /work was intended to show. I changed the highlighting to only highlight the (socials).tsx file as this what the text in the section is talking about, but perhaps missed the original intent.

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[klequis]

Addresses issue #722