- Added the index number corresponding to the instruction code.
- Omitted trailing `|` from table elements.
The table elements in GitHub Flavored Markdown can't wrap wherever wanted.
And trying to align the end of it tends to make the whole thing longer.
Allow to update `doc/internal/opcode.md` file mechanically from `include/mruby/ops.h` file.
At the same time, the `doc/internal/opcode.md` file has been updated.
Consecutive hyphens at the end of the table were removed as they would have created noise as markdown flavours.
Transforms the value of a splat inside a return statement (similar
to an array). For example, `return *nil` should return `nil.to_a`,
while `return *1` should return `[1]`