Consolidating terminology around RelayChain

[andrewnguyen22]

Describe the bug Consolidating terminology around non native chain/chains/blockchains/netid/network id/network identifier (In documentation and code)

[jeremybeal11]

terminology should be:

external chains - chains that are outside of pocket
chain id - represents the network running (testnet, mainnet, devnet)
network id - the subnetwork of the external chains(eth rink, BTC mainnet) 

[jeremybeal11]

Some examples are:

1. when a user enters in pocket util generate-chains it asks them to Enter the ID of the network identifier:. When they go to the supported networks page to find ETH rinkeby for example, The Network ID shows 4 when in reality it should be 0025 which is under the chainID column.
2. when a user want to stake their node using pocket nodes stake <fromAddr> <amount> <chains> <serviceURI> <chainID> <fees> they go back to the supported networks page and see's that the chainID is 0001 when it shuld be mainnet which is under the network ID column

[BenVanGithub]

I propose that the user facing part of this issue can and should be dealt with now. The documentation nomencalature is not directly tied to the code nomenclature or vice-versa. I propose this: search every page in the docs site., Identify every use of the word "chain" Determine if it is referring to a relay chain or a pocket blockchain. Add the appropriate word directly to the existing word. Therefore: < chain > would become either < relayChain > or < networkChain >