Add notes about untrusted data in System.Speech API docs

[jeffhandley]

No description provided.

[Copilot]

Pull Request Overview

This PR adds security documentation notes about handling untrusted data across various System.Speech API documentation files. The changes use include files to provide consistent warnings about security considerations when working with external data sources.

• Adds untrusted data warnings to speech synthesis and recognition classes
• Replaces existing security guidance with standardized include notes
• Applies appropriate note types (class-level, instance-level, and interface-level warnings)

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
xml/System.Speech.Synthesis/SpeechSynthesizer.xml	Adds class-level untrusted data warnings for lexicon-related methods
xml/System.Speech.Synthesis/PromptBuilder.xml	Adds class-level untrusted data warnings for prompt building methods
xml/System.Speech.Synthesis/FilePrompt.xml	Adds instance-level untrusted data warnings to class and constructor documentation
xml/System.Speech.Synthesis.TtsEngine/TtsEngineSsml.xml	Adds class-level untrusted data warnings for AddLexicon and RemoveLexicon methods
xml/System.Speech.Synthesis.TtsEngine/ITtsEngineSite.xml	Adds interface-level untrusted data warning to LoadResource method
xml/System.Speech.Recognition/Grammar.xml	Replaces existing security guidance with instance-level untrusted data warnings across multiple constructors
xml/System.Speech.Recognition.SrgsGrammar/SrgsRuleRef.xml	Adds instance-level untrusted data warnings to class and multiple constructors
xml/System.Speech.Recognition.SrgsGrammar/SrgsDocument.xml	Adds instance-level untrusted data warning to XmlBase property documentation

[pranav-gupta-msft]

LGTM