Incorrect Commands for Iroha Client CLI in Documentation

[AlexStroke]

Description:
The current documentation instructs users to build the Iroha client using the following command:

cargo build -p iroha_client_cli --release

The correct command to build the Iroha client is:

cargo build --bin iroha

The artifacts will then be found in the target/debug directory.

Suggested Fix:
Update the documentation to use the correct build command:

cargo build --bin iroha

And specify that the artifacts will be in the target/debug directory.
As well replace all places with iroha_client_cli on iroha.

[0x009922]

Related: #480