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Summary of Changes

Hello! Gemini here, providing a summary of this pull request to help everyone quickly understand the changes. This PR, authored by matz, focuses on improving the documentation within the mruby project. Specifically, it adds detailed Doxygen-style comments to several key MRB_API functions in the src/proc.c file. These comments aim to clarify the purpose, parameters, and return values of functions related to creating and interacting with C functions wrapped as mruby Proc objects. This is a valuable contribution for developers working with the mruby C API, making it easier to understand how to use these core functions correctly.

Highlights

Targeted Functions: Comments are added for specific MRB_API functions in src/proc.c that handle C function-based Proc objects: mrb_proc_new_cfunc, mrb_proc_new_cfunc_with_env, mrb_closure_new_cfunc, and mrb_proc_cfunc_env_get.
API Clarity: The new comments describe the function's purpose, parameters (like mrb_state, function pointers, argument counts, environment values, and indices), return values, and important behaviors or potential errors (like index out of bounds or type errors for mrb_proc_cfunc_env_get).

Changelog

src/proc.c
- Added Doxygen-style comment block before the mrb_proc_new_cfunc function definition, describing its purpose, parameters (mrb, func), and return value.
- Added Doxygen-style comment block before the mrb_proc_new_cfunc_with_env function definition, detailing its purpose, parameters (mrb, func, argc, argv), and return value, noting that environment values are copied.
- Added a comprehensive Doxygen-style comment block before the mrb_closure_new_cfunc function definition, explaining its role in creating closures with an environment, its parameters (mrb, func, nlocals), and return value.
- Added a detailed Doxygen-style comment block before the mrb_proc_cfunc_env_get function definition, clarifying its use for accessing environment values from C function Procs, describing parameters (mrb, idx), return value, and listing potential E_TYPE_ERROR and E_INDEX_ERROR exceptions.

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