Fix empty description help section

[marko1olo]

Fixes #2114.

This suppresses the default help Description: section when the command description is null, empty, or whitespace. Descriptions are optional, so help output should not render an empty section.

Changes:

• SynopsisSection() now returns false for null/empty/whitespace descriptions.
• Adds regression coverage for null, empty, and whitespace descriptions.
• Updates an existing help expectation that previously asserted a blank Description: section.

Validation:

• git diff --check

Not run locally:

• targeted dotnet test for System.CommandLine.Tests help tests.

Reason: current machine CPU stayed above the local process gate threshold, so I did not start a .NET test/build process. The change is small and covered by added/updated tests in this PR.

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[jonsequitur]

The change is correct but I had to dig a little to see that this method name is wrong. It should be something like CommandDescriptionSection. Would you mind renaming it?

[marko1olo]

Renamed in 7829e695 to CommandDescriptionSection() and updated the XML summary as well.

Local checks: git diff --check passed. I couldn't run dotnet test here because this checkout requires SDK 11.0.100-preview.4.26210.111 from global.json, while this machine only has SDK 10.0.202 installed.