cmd/go/internal: remove note about GOCACHE=off

Setting GOCACHE=off is no longer allowed in upcoming releases of Go. Fixes golang#29680
thaJeztah · Jan 11, 2019 · 31e904f · 31e904f
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diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
diff --git a/src/cmd/go/internal/help/helpdoc.go b/src/cmd/go/internal/help/helpdoc.go
@@ -705,7 +705,6 @@ The default location for cache data is a subdirectory named go-build
 in the standard user cache directory for the current operating system.
 Setting the GOCACHE environment variable overrides this default,
 and running 'go env GOCACHE' prints the current cache directory.
-You can set the variable to 'off' to disable the cache.
 
 The go command periodically deletes cached data that has not been
 used recently. Running 'go clean -cache' deletes all cached data.