This commit adds Doxygen-style comments to the following functions
in src/dump.c, ensuring "@brief" is not used:
Non-static functions (comments reviewed/updated):
- mrb_dump_irep
- mrb_dump_irep_binary
- mrb_dump_irep_cfunc
Static functions (new comments added):
- write_irep_header
- write_iseq_block
- dump_float (if compiled)
- get_pool_block_size
- write_pool_block
- get_syms_block_size
- write_syms_block
- get_irep_record_size
This work is part of a larger effort to document all non-trivial
functions in this file as per your feedback. The remaining functions
will be documented in subsequent commits.