fix link in readme

readme.md

@@ -12,7 +12,7 @@ is a general purpose allocator with excellent [performance](#performance) charac
 Initially developed by Daan Leijen for the runtime systems of the
 [Koka](https://koka-lang.github.io) and [Lean](https://github.com/leanprover/lean) languages.
 
-Latest release tag: `v2.1.8` (2025-01-03).
+Latest release tag: `v2.1.8` (2025-01-03).  
 Latest v1 tag: `v1.8.8` (2024-01-03).
 
 mimalloc is a drop-in replacement for `malloc` and can be used in other programs
@@ -81,7 +81,7 @@ Enjoy!
 
 ### Releases
 
-* 2025-01-03, `v1.8.8`, `v2.1.8`, `v3.0-alpha`: Interim release. Support Windows arm64. New guarded build that can place OS 
+* 2025-01-03, `v1.8.8`, `v2.1.8`, `v3.0-alpha`: Interim release. Support Windows arm64. New [guarded](#guarded) build that can place OS 
   guard pages behind objects to catch buffer overflows as they occur. 
   Many small fixes: build on Windows arm64, cygwin, riscV, and dragonfly; fix Windows static library initialization to account for
   thread local destructors (in Rust/C++); macOS tag change; macOS TLS slot fix; improve stats;