ref: fix typo to GOWORK

Fixes golang/go#53550

Change-Id: I1d354930c9482ab6f85852b900baf09de2472760
Reviewed-on: https://go-review.googlesource.com/c/website/+/414154
Auto-Submit: Carlos Amedee <carlos@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/_content/ref/mod.md b/_content/ref/mod.md
index be039b3..9c60bcb 100644
--- a/_content/ref/mod.md
+++ b/_content/ref/mod.md
@@ -1097,7 +1097,7 @@
 If `GOWORK` names a path to an existing file that ends in .work,
 workspace mode will be enabled. Any other value is an error. You can use the
 `go env GOWORK` command to determine which `go.work` file the `go` command
-is using. `go env gowork` will be empty if the `go` command is not in workspace
+is using. `go env GOWORK` will be empty if the `go` command is not in workspace
 mode.
 
 ### `go.work` files {#go-work-file}