OpenZFS 9862 - fix typo in comment in vdev_impl.h

[gmelikov]

Authored by: Allan Jude allanjude@freebsd.org
Reviewed by: Matthew Ahrens mahrens@delphix.com
Reviewed by: Brian Behlendorf behlendorf1@llnl.gov
Approved by: Robert Mustacchi rm@joyent.com
Ported-by: George Melikov mail@gmelikov.ru

OpenZFS-issue: https://www.illumos.org/issues/9862
OpenZFS-commit: openzfs/openzfs@84927f5

Motivation and Context

Code base consistence.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the ZFS on Linux code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov]

Codecov Report

Merging #8036 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8036      +/-   ##
==========================================
+ Coverage   78.46%   78.48%   +0.02%     
==========================================
  Files         377      377              
  Lines      114404   114404              
==========================================
+ Hits        89765    89792      +27     
+ Misses      24639    24612      -27

Flag	Coverage Δ
#kernel	78.76% <ø> (+0.05%)	⬆️
#user	67.21% <ø> (-0.07%)	⬇️

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