docs: Replace src lsif with src code-intel.
Created by: varungandhi-src
Forgot to do this after https://github.com/sourcegraph/src-cli/pull/748 and https://github.com/sourcegraph/src-cli/pull/750
Test plan
Ran tests locally.
Created by: varungandhi-src
Forgot to do this after https://github.com/sourcegraph/src-cli/pull/748 and https://github.com/sourcegraph/src-cli/pull/750
Ran tests locally.