README grammar and formatting tweaks

[UncertainBadg3r]

Changes

• README.md: Update grammar and formatting to make steps easier to follow.

Fixes

• Documentation only fixes.

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

[service-0chain]

Manual system tests [cancelled] with the following config

config	value
tests skipped	false
system-tests
gosdk	staging
zboxcli
zwalletcli
0chain
blobber
authorizer
0box
0dns