This pull request updates the documentation for the dotnet test command to clarify and simplify option usage. The main changes remove the --directory option and update related descriptions and examples to reflect this deprecation.

Command option updates:

• Removed the --directory option from the documented command usage and option list, including its description. [1] [2]
• Updated the descriptions for --project and --solution to clarify that they accept either a folder name or full path, and now default to the current directory if not specified.

Documentation and examples:

• Removed the example showing usage of the deprecated --directory option.

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