_content/doc/install: fix broken link to system requirements

Fixes golang/go#58464.

Change-Id: Id2477d488046977e2d1554f577b4c18f988d6583
Reviewed-on: https://go-review.googlesource.com/c/website/+/469975
Auto-Submit: Jamal Carvalho <jamal@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Jamal Carvalho <jamal@golang.org>

_content/doc/install/source.html

@@ -111,16 +111,10 @@ discussion of <a href="#environment">environment variables</a> below.
 </p>
 
 <p>
-See the main installation page for the <a href="/doc/install#requirements">overall system requirements</a>.
-The following additional constraints apply to systems that can be built only from source:
+See the Go Wiki MinimumRequirements page for the
+<a href="/wiki/MinimumRequirements">overall system requirements</a>.
 </p>
 
-<ul>
-<li>For Linux on PowerPC 64-bit, the minimum supported kernel version is 2.6.37, meaning that
-Go does not support CentOS 6 on these systems.
-</li>
-</ul>
-
 </div>
 
 <h2 id="go14">Install Go compiler binaries for bootstrap</h2>