Fix spelling, grammar, and formatting issues in Copilot documentation

[Copilot]

Addressed spelling, grammar, and formatting issues identified in code review for the structured output documentation.

Changes Made

• Spelling corrections: "splitted" → "split", "builded" → "built", "ocurrence" → "occurrence"
• Grammar fixes: "its" → "it's" (possessive vs. contraction), "information its crucial" → "information is crucial"
• Clarity improvements: "at the final of" → "at the end of", "This causes that" → "This causes"
• Formatting: Removed excessive blank lines in Advanced Settings section

Files Modified

• docs/developer-guide/etendo-copilot/how-to-guides/how-to-create-an-agent.md - Fixed grammar in Knowledge Base File Behavior table and tips section
• docs/user-guide/etendo-copilot/setup-and-usage.md - Removed extra blank lines after JSON Schema field

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