docs: fix svelte 5 discord channel name & release estimation (#12465)

* docs: fix svelte 5 discord channel name

* docs: fix release estimate

* Apply suggestions from code review

---------

Co-authored-by: Rich Harris <hello@rich-harris.dev>

sites/svelte-5-preview/src/routes/docs/content/02-examples/06-more-examples.md

@@ -4,4 +4,4 @@ title: More examples
 
 Check out [component-party.dev](https://component-party.dev/?f=svelte4,svelte5) to see side-by-side comparisons of some common patterns.
 
-We'll add more examples over time, but if there's something in particular you'd like to see then hop over to the `#svelte-5-alpha` channel of the [Svelte Discord](https://svelte.dev/chat).
+We'll add more examples over time, but if there's something in particular you'd like to see then hop over to the `#svelte-5-rc` channel of the [Svelte Discord](https://svelte.dev/chat).

sites/svelte-5-preview/src/routes/docs/content/03-appendix/01-faq.md

@@ -116,7 +116,7 @@ npm i --save-dev prettier-plugin-svelte prettier
 
 ### When is it coming out?
 
-When it's done. The goal is sometime in early 2024.
+When it's done. The goal is sometime in 2024.
 
 ### Should I prepare my code for Svelte 5?
 
@@ -154,8 +154,8 @@ We appreciate your enthusiasm! We welcome issues on the [sveltejs/svelte](https:
 
 ### How can I share feedback or cool examples of what this enables?
 
-You can use the `#svelte-5-alpha` channel on the [Discord server](https://svelte.dev/chat) or the tag `#svelte-5-alpha` on social media.
+You can use the `#svelte-5-rc` channel on the [Discord server](https://svelte.dev/chat) or the tag `#svelte-5` on social media.
 
 ### My question wasn't answered. What gives?
 
-It must not have been asked frequently enough. To fix that, stop by the `#svelte-5-alpha` channel of the [Discord server](https://svelte.dev/chat).
+It must not have been asked frequently enough. To fix that, stop by the `#svelte-5-rc` channel of the [Discord server](https://svelte.dev/chat).