Fix spelling

[jbampton]

[codecov[bot]]

Codecov Report

Merging #1577 into master will decrease coverage by 0.11%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1577      +/-   ##
==========================================
- Coverage   69.66%   69.55%   -0.12%     
==========================================
  Files          59       59              
  Lines        4385     4385              
==========================================
- Hits         3055     3050       -5     
- Misses        898      901       +3     
- Partials      432      434       +2     

Impacted Files	Coverage Δ
core/adminserver/admin_server.go	62.50% <ø> (ø)
core/client/get_and_verify.go	62.96% <0.00%> (ø)
core/client/meetinthemiddle.go	100.00% <ø> (ø)
core/keyserver/keyserver.go	61.63% <0.00%> (ø)
core/mutator/entry/mutator.go	60.46% <ø> (ø)
core/keyserver/revisions.go	62.58% <0.00%> (-2.05%)	:arrow_down:
impl/mysql/directory/storage.go	67.66% <0.00%> (-1.51%)	:arrow_down:

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