Update Text Formatting in api-reference.md

[linuxmunchies]

This PR addresses inconsistent text formatting in the open-subsonic documentation that was causing rendering issues and confusion for devs.

Changes Standardized asterisk formatting: Fixed inconsistent bolding of asterisks in api-reference.md page of the documentation

~~Enhanced accessibility: Standardized the formatting of "Yes/No" indicators to always use bold styling~~ Unnecessary, removed in patch below.

Motivation These inconsistencies were causing problems with text rendering and creating a confusing reading experience. This should boost documentation readability, rendering consistency across different Markdown viewers, and accessibility for all users.

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[Tolriq]

There's 150 pages of docs :) In all of them the no is not bold for a reason and a clear separation between both cases.

Bo problem to fix the * bolding in those special cases.