Fixing Typo and Video for Deploying Subgraph local node 

Current available documentation/tutorial has typos and issues that may cause problems to new Devs.
I personally was stuck on multiple errors through the process and would like to create a video tutorial showing how to do it correctly.
Current documentation - https://docs.harmony.one/home/developers/tutorials/the-graph-subgraphs/building-and-deploying-subgraph-local-node