Acrolinx pass on a few diagnostics tutorials

[gewarren]

---

Internal previews

📄 File	🔗 Preview link
docs/core/diagnostics/observability-applicationinsights.md	Example: Use OpenTelemetry with Azure Monitor and Application Insights
docs/core/diagnostics/observability-otlp-example.md	"Example: Use OpenTelemetry with OTLP and the standalone Aspire Dashboard"
docs/core/diagnostics/observability-prgrja-example.md	Example: Use OpenTelemetry with Prometheus, Grafana, and Jaeger

[Copilot]

Pull request overview

This PR applies an Acrolinx pass to improve the writing style and consistency across three diagnostics tutorial documents. The changes focus on grammar corrections, present tense usage, contraction standardization, and improved clarity in technical documentation.

Key changes:

• Corrects article indefinite article usage ("An" to "A" in descriptions)
• Standardizes contractions (doesn't, you'll, it's) following Microsoft style guidelines
• Converts future tense to present tense for instructions and descriptions
• Improves list formatting with colons and proper punctuation
• Enhances clarity by breaking up long sentences and improving flow

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/core/diagnostics/observability-prgrja-example.md	Style improvements including grammar fixes (doesn't vs does not), present tense adoption, URL capitalization, list formatting with colons, and sentence restructuring for clarity
docs/core/diagnostics/observability-otlp-example.md	Grammar corrections, contraction standardization, present tense conversion, Docker capitalization, and improved sentence flow throughout the tutorial
docs/core/diagnostics/observability-applicationinsights.md	Corrected description article, standardized verb form (Set up vs Setup), and improved Azure portal capitalization