Fix: Update Synapse expressions doc to use single quotes [4.4.0]

[wso2-engineering-bot]

This PR was automatically generated by Claude AI.

• Issue: Update Synapse expressions doc #2057
• Type: Suggestions
• Summary: Updated Synapse expressions documentation to use single quotes instead of double quotes for string literals in examples. This improves source file readability as double quotes appear escaped in configuration contexts. Added notes indicating that both single quotes and double quotes are valid for string literals and function arguments.
• Style Scope Verification: Microsoft Style Guidelines have been applied ONLY to newly added content (the explanatory notes) without modifying existing content style unless specifically requested.
• Verification: Documentation builds successfully (pre-existing navigation warning unrelated to these changes)

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