docs: add "Troubleshooting" section to "Create Development Wallet" page

[DanailMinchev]

Hi,

While going through the setup I encountered some errors using the latest macOS Big Sur.
Just re-installing EOSIO with updated PostgreSQL fixed the issue.

Added Troubleshooting to describe that.

Thanks

[halsaphi]

hi Danail,

Thanks for the PR.

I wasn't aware that cleos had a dependancy on postgresql - will investigate this.

Phil

[DanailMinchev]

Hi Phil,

Thank you, I think it was failing also for nodeos when try to call it nodeos --help. It is not specific to cleos only, but if I follow the tutorial, the cleos is the first interaction with EOSIO tools, that is why I have added that to the cleos page. I can move this somewhere else if you identify it as a problem as well.