Update documentation

[olstakh]

This pull request adds comprehensive documentation for all analyzer rules in the Xunit.v3.IntegrationTesting package, including a summary table, individual rule details, and explanations of the new [DependsOnClasses] attribute. It also updates the shipped analyzer release notes to reflect the addition of these new rules.

Documentation of analyzer rules:

• Added a summary table of all Xunit.v3.IntegrationTesting analyzer rules, including rule IDs, categories, descriptions, severities, enablement, and code fix availability in docs/README.md.
• Added detailed documentation for rules XIT0001–XIT0016, each describing the rule's purpose, source, severity, and how to resolve violations, in individual files under docs/Rules/. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

Enhancements to usage documentation:

• Expanded Test-collection-dependencies.md with a new section explaining the [DependsOnClasses] attribute, its syntax, source generation behavior, and how it interacts with analyzer rules XIT0013 and XIT0014.

Analyzer release notes:

• Updated AnalyzerReleases.Shipped.md to document the release of version 1.0.11 and list all new analyzer rules with their categories, severities, and summaries.