Fix #2259 .
include/mruby/opcode.h fix operation doc
src/vm.c fix operation doc
[ci skip]
const_missing error message more detail
Replace tabs with spaces in eval.c
Add new line behind return type
Merge pull request #2261 from take-cheeze/fix_2259

Fix #2259 .
Merge pull request #2262 from ksss/doc-opcode

[DOC] fix op code doc
Merge pull request #2263 from suzukaze/replace-tab-with-space

Replace tabs with spaces in eval.c
Merge pull request #2264 from ksss/const_missing

const_missing error message more detail
Merge pull request #2265 from suzukaze/refactor

Add new line behind return type
Fix indents
Merge pull request #2266 from suzukaze/fix-indent

Fix indents