doc/go1.18.html: fix a typo

gofmt -> <code>gofmt</code>

Change-Id: Idc01b01d8eb185f5e378000d11d622935b14db6e
GitHub-Last-Rev: 8d55dc7b86ce0f7dfbdbd57c349b4c472eccf907
GitHub-Pull-Request: golang/go#49084
Reviewed-on: https://go-review.googlesource.com/c/go/+/357251
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Daniel Martí <mvdan@mvdan.cc>
diff --git a/doc/go1.18.html b/doc/go1.18.html
index 087a06c..985689c 100644
--- a/doc/go1.18.html
+++ b/doc/go1.18.html
@@ -98,7 +98,7 @@
 <p><!-- https://golang.org/issue/43566 -->
   <code>gofmt</code> now reads and formats input files concurrently, with a
   memory limit proportional to <code>GOMAXPROCS</code>. On a machine with
-  multiple CPUs, gofmt should now be significantly faster.
+  multiple CPUs, <code>gofmt</code> should now be significantly faster.
 </p>