Merge branch 'ash2k/use-pre-built-lsif-go' into 'master'

docs: use pre-built docker image for lsif-go

See merge request gitlab-org/gitlab!40680

doc/user/project/code_intelligence.md

@@ -26,10 +26,9 @@ Enable code intelligence for a project by adding a GitLab CI/CD job to the proje
 
 ```yaml
 code_navigation:
-  image: golang:1.14.0
+  image: sourcegraph/lsif-go:v1
   allow_failure: true # recommended
   script:
-    - go get github.com/sourcegraph/lsif-go/cmd/lsif-go
     - lsif-go
   artifacts:
     reports: