_content/doc: fix go mod edit for PowerShell

"-replace=foo.com=bar.com" triggers this bug in PowerShell:
https://github.com/PowerShell/PowerShell/issues/6291
The go command accepts "-replace foo.com=bar.com" just fine. Use that
instead.

Fixes #44924.

Change-Id: I854ea86282db425a2707c641b0500208b4869870
Reviewed-on: https://go-review.googlesource.com/c/website/+/330229
Trust: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Steve Traut <straut@google.com>
diff --git a/_content/doc/tutorial/call-module-code.html b/_content/doc/tutorial/call-module-code.html
index 1a63d8c..fa4628a 100644
--- a/_content/doc/tutorial/call-module-code.html
+++ b/_content/doc/tutorial/call-module-code.html
@@ -143,7 +143,7 @@
         command:
 
     <pre>
-$ go mod edit -replace=example.com/greetings=../greetings
+$ go mod edit -replace example.com/greetings=../greetings
 </pre>
 
     <p>