Update NOTICE to add license declaration for sphinx

[Radhika Gupta (rads-1996)]

Addresses - https://dev.azure.com/ossmsft/Reviews/_workitems/edit/55986

[Copilot]

🟢 Approval recommended

The change is limited to NOTICE text updates and appears internally consistent and complete for the stated attribution purpose.

Pull request overview

Updates the repository’s third-party notices by adding an explicit Sphinx license declaration to NOTICE.md, aligning the NOTICE contents with dependency attribution obligations.

Changes:

• Fixes formatting/indentation of the concluding NOTICE sentence so it’s a normal paragraph line.
• Adds the Sphinx BSD 2-clause license notice text to NOTICE.md.

File summaries

File	Description
NOTICE.md	Adds Sphinx license notice text and normalizes NOTICE formatting for third-party attribution.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[github-actions]

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
azure_monitor_log	yes	19,803.9	20,006.8	-1.01%	✅
azure_monitor_span	yes	159,438.8	152,392.6	+4.62%	✅
otel_log	no	23,024.5	23,336.7	-1.34%	✅
otel_span	no	41,008.8	40,739.8	+0.66%	✅