Document oslmath

[dogo]

Description:

This PR enhances the documentation for the OSLib Math functions, which utilize the PSP's Vector Floating Point Unit (VFPU). The updates include:

• Improved Clarity: Each function's purpose, parameters, and return values are now clearly explained, making it easier for developers to understand the functionality and expected behavior.
• Consistency: The format and language across all function descriptions have been standardized to ensure uniformity throughout the header file.
• Additional Details: Relevant information, such as input ranges, specific behaviors, and edge cases, has been added where applicable to provide a comprehensive understanding of each function.
• Enhanced Readability: Grammar and stylistic improvements have been made to enhance the overall readability and professionalism of the documentation.

These changes aim to make the OSLib Math functions more accessible and easier to use for developers, contributing to better maintainability and usability of the library.