Update index.ngdoc

Request Type: docs

How to reproduce: When following documentation with a proxy, it does not work. 
Some minor tips need to be given to git or npm beginner.

Component(s): 

Impact: small

Complexity: small

This issue is related to: 

**Detailed Description:**

I've already did a documentation patch for it.

**Other Comments:**

The documentation do not work if your are working with a proxy.