newsletter: Use the correct PR numbers and links

Author: tcl3

src/content/newsletters/2026-03-31.mdx

@@ -42,7 +42,7 @@ After the initial landing, we spent much of the month squeezing more out of the
 - Caching the program base + program counter in a callee-saved register on AArch64
 - Eliding redundant floating-point comparisons in consecutive branch instructions
 - Moving NaN canonicalization to cold fixup blocks
-- Emitting proper unwind info for both x86_64 and AArch64 so profilers and debuggers can unwind through assembly frames ([#8484](https://github.com/LadybirdBrowser/ladybird/pull/8484))
+- Emitting proper unwind info for both x86_64 and AArch64 so profilers and debuggers can unwind through assembly frames ([#8455](https://github.com/LadybirdBrowser/ladybird/pull/8455))
 
 ### More sites working
 
@@ -97,7 +97,7 @@ In the parser, we boxed large AST enum variants, bringing `ExpressionKind` from
 | ------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
 | [![Before](/assets/img/newsletter-mar-2026-flexbox-baseline-before.png)](/assets/img/newsletter-mar-2026-flexbox-baseline-before.png) | [![After](/assets/img/newsletter-mar-2026-flexbox-baseline-after.png)](/assets/img/newsletter-mar-2026-flexbox-baseline-after.png) |
 
-- **`clip-path: inset()` border-radius**: The `inset()` function now supports border-radius values. ([#8540](https://github.com/LadybirdBrowser/ladybird/pull/8540))
+- **`clip-path: inset()` border-radius**: The `inset()` function now supports border-radius values. ([#8442](https://github.com/LadybirdBrowser/ladybird/pull/8442))
 
 ### Style invalidation