_content/blog: fix link in loopvar-preview post

A link to the Go release policy was broken. Fix it.

Change-Id: Idd158e32063a07d2924c1cdf50a0293e0a891a70
Reviewed-on: https://go-review.googlesource.com/c/website/+/529257
Auto-Submit: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Tim King <taking@google.com>
Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/_content/blog/loopvar-preview.md b/_content/blog/loopvar-preview.md
index bcd652c..ed0d629 100644
--- a/_content/blog/loopvar-preview.md
+++ b/_content/blog/loopvar-preview.md
@@ -148,7 +148,7 @@
 the point releases Go 1.20.8 and Go 1.19.13,
 so when Go 1.22 is released,
 code written depending on the new semantics will never be compiled with
-the old semantics, unless people are using very old, unsupported Go versions](/doc/devel/release#policy).
+the old semantics, unless people are using very old, [unsupported Go versions](/doc/devel/release#policy).
 
 
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