Fix code-only examples & HTTP method cleanup

[brianstrauch]

Checklist

1. [CRUCIAL] Is the change for CP or CCloud functionalities that are already live in prod?

   • yes: ok

2. Did you add/update any commands that accept secrets as args/flags?

   • no: ok

What

Miscellaneous fixes:

• Replace all instances of "GET", "POST", etc. with http.MethodGet, http.MethodPost, etc.
• Remove unused .goreleaser-fake.yml file
• Use cmd for root command & remove unnecessary DisableAutoGenTag field.
• Fix example output when there is no text

Test & Review

Before:

Examples:
Resume a connector in the current or specified Kafka cluster context.

  $ confluent connect resume --config config.json



  $ confluent connect resume --config config.json --cluster lkc-123456

After:

Examples:
Resume a connector in the current or specified Kafka cluster context.

  $ confluent connect resume --config config.json

  $ confluent connect resume --config config.json --cluster lkc-123456

[DABH]

Looks good, thanks for the quality improvements!

[brianstrauch]

Schema registry is still failing to build in Muckrake. Merging...