_content/blog/12years: correct the link to blog/ports

Change-Id: Iaba22430959dd3caef9f5be946ff434258e81c7e
Reviewed-on: https://go-review.googlesource.com/c/website/+/375314
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/_content/blog/12years.md b/_content/blog/12years.md
index 77c6999..f0691ca 100644
--- a/_content/blog/12years.md
+++ b/_content/blog/12years.md
@@ -17,7 +17,7 @@
 [replacing godoc.org with pkg.go.dev](/blog/godoc.org-redirect).
 
 In February, the [Go 1.16 release](/blog/go1.16)
-added [macOS ARM64 support](blog/ports),
+added [macOS ARM64 support](/blog/ports),
 added [a file system interface](/pkg/io/fs) and [embedded files](/pkg/embed),
 and [enabled modules by default](/blog/go116-module-changes),
 along with the usual assortment of improvements and optimizations.