docs(onami): remove unecessary capitalisations

[spifory]

Rationale

This pull request is being made because Vincent use to have a habit of capitalising every word in a sentence 😂

Summary of changes made

This pull request removes the capitalisation of all the relevant areas where unnecessary was used.

Checklist

• This PR changes the onami module/cog codebase
  • These changes add new functionality to the module/cog
  • These changes fix an issue or bug in the module/cog
  • I have tested that these changes work on a production bot codebase
  • I have tested these changes against the CI/CD test suite
  • I have updated the documentation to reflect these changes
• This PR changes the CI/CD test suite
  • I have tested my suite changes are well-formed (all tests can be discovered)
  • These changes adjust existing test cases
  • These changes add new test cases
• This PR changes prose (such as the documentation, README or other Markdown/RST documents)
  • I have proofread my changes for grammar and spelling issues
  • I have tested that any changes regarding Markdown/RST syntax result in a well formed document