Fix various misspellings (#1381)

[bvwells]

Fix various misspellings (#1381)

[codecov-commenter]

Codecov Report

Merging #1383 into v2 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v2    #1383   +/-   ##
=======================================
  Coverage   58.95%   58.95%           
=======================================
  Files          32       32           
  Lines        3927     3927           
=======================================
  Hits         2315     2315           
  Misses       1358     1358           
  Partials      254      254           

Impacted Files	Coverage Δ
runtime/context.go	66.98% <ø> (ø)
runtime/handler.go	45.37% <ø> (ø)
runtime/marshal_httpbodyproto.go	76.92% <ø> (ø)
runtime/marshaler.go	100.00% <ø> (ø)

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[johanbrandhorst]

Thanks for your contribution!