Add iterator_step_by to the unstable book's summary

This commit is contained in:
Scott McMurray 2017-05-20 18:05:18 -07:00
parent 57f260d418
commit 4be488c065

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@ -156,6 +156,7 @@
- [io](library-features/io.md)
- [ip](library-features/ip.md)
- [iter_rfind](library-features/iter-rfind.md)
- [iterator_step_by](library-features/iterator-step-by.md)
- [libstd_io_internals](library-features/libstd-io-internals.md)
- [libstd_sys_internals](library-features/libstd-sys-internals.md)
- [libstd_thread_internals](library-features/libstd-thread-internals.md)