LAB00: Small text and formatting issues over several labs

[SeyfSV]

Changes proposed in this pull request:

This pull request introduces a variety of enhancements focusing on code formatting, spelling corrections, and minor clarifications in the documentation.

M03:

• Added subscriptionId variable initialization. It's already exists but in optional task.
• Added steps to disable the Build Validation policy in addition to the Require a minimum number of reviewers policy.

M07: a minor spelling error

M09:

• improved formatting of yaml snippets
• clarified the addition of failureCriteria snippet
• fixed the Resource Group name in the deletion script
• occasional high amount of fixes related to the Trailing Whitespaces

[LuizMacedo]

Thanks @SeyfSV! I was working in other updates for the labs, so I'll incorporate yours into mine and publish using #551.