docs: enhance script name handling in logging documentation

[GingerGraham]

This pull request updates the documentation to clarify how the %s placeholder in log formats works and provides guidance on customizing the script name for logging. It emphasizes that %s reflects the value set via set_script_name, and offers examples for dynamically setting it to reflect runtime context such as function names or user names.

Documentation improvements for %s and script name handling:

• Clarified in docs/formatting.md that %s in log formats reflects the script name set during initialization or via set_script_name, and explained how to use it for custom runtime context by updating the script name in your code.
• Updated docs/initialization.md to instruct users to use set_script_name during runtime for dynamic log identifiers, with a pointer to the runtime configuration documentation.
• Added detailed shell code examples and guidance in docs/runtime-configuration.md for setting %s to function names, user names, or other runtime-specific identifiers, and clarified that the logger does not infer these automatically.

Documentation structure and navigation:

• Fixed the order of functions in the runtime configuration documentation's table of contents to correctly list set_timezone_utc after set_log_level.

Fixes: #29 #30

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