29979: Removed the use of expect from CodingStandardsRust

[elichai]

Hi,
After watching your talk (https://www.youtube.com/watch?v=WI4ApeHH9QE) I came to read the documentation here,
and you're telling to use expect() instead of unwrap() but expect also makes the whole program panic and unwind.
so neither expect should be used unless justified.

[coveralls]

Pull Request Test Coverage Report for Build 4514

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.01%) to 62.26%

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Files with Coverage Reduction	New Missed Lines	%
src/core/or/relay.c	1	49.33%
src/core/or/circuitpadding.c	3	92.07%

Totals
Change from base Build 4473:	0.01%
Covered Lines:	46181
Relevant Lines:	74175

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💛 - Coveralls

[teor2345]

Thanks for the pull request!
There are just a few typos that need fixing.

We use trac as our task tracker, this change is being tracked in:
https://trac.torproject.org/projects/tor/ticket/29979

[teor2345]

Thanks! Someone else will squash and merge in the next few days.

[nmathewson]

Squashed and merged!