fix: typo in CodeGen

[trivikr]

Issue #, if available:
Fixes: #904

Description of changes:
fixes typo in CodeGen

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Codecov Report

Merging #905 into smithy-codegen will decrease coverage by 0.05%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           smithy-codegen     #905      +/-   ##
==================================================
- Coverage           92.18%   92.12%   -0.06%     
==================================================
  Files                 149      145       -4     
  Lines                2930     2908      -22     
  Branches              516      513       -3     
==================================================
- Hits                 2701     2679      -22     
  Misses                229      229

Impacted Files	Coverage Δ
packages/signature-v4/src/suite.fixture.ts
packages/signature-v4-node/src/index.ts
packages/signature-v4-browser/src/index.ts
packages/signature-v4-universal/src/index.ts

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