Fix various misspellings

[bvwells]

Fix various misspellings

[codecov-commenter]

Codecov Report

Merging #1381 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1381   +/-   ##
=======================================
  Coverage   54.14%   54.14%           
=======================================
  Files          42       42           
  Lines        4375     4375           
=======================================
  Hits         2369     2369           
  Misses       1750     1750           
  Partials      256      256           

Impacted Files	Coverage Δ
...-grpc-gateway/descriptor/grpc_api_configuration.go	29.62% <ø> (ø)
runtime/context.go	67.36% <ø> (ø)
runtime/errors.go	50.00% <ø> (ø)
runtime/handler.go	47.50% <ø> (ø)
runtime/marshal_httpbodyproto.go	76.92% <ø> (ø)
runtime/marshaler.go	100.00% <ø> (ø)
runtime/proto_errors.go	34.88% <ø> (ø)

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[johanbrandhorst]

Thanks! Could you please cherry pick this against v2?