Copy tweaks in s3-request-presigner README

[jblz]

• Signify that the second example is ES6-specific -- not Typescript
• Minor grammar corrections:
  • "when instantiating" vs. "when instantiate"
  • "the configuration of an" vs. "the configurations of an"
  • "an existing client" vs. "an existing clients"

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[codecov-commenter]

Codecov Report

Merging #1440 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1440      +/-   ##
==========================================
- Coverage   79.69%   79.67%   -0.02%     
==========================================
  Files         302      299       -3     
  Lines       11402    11391      -11     
  Branches     2438     2431       -7     
==========================================
- Hits         9087     9076      -11     
  Misses       2315     2315              

Impacted Files	Coverage Δ
protocol_tests/aws-ec2/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-json/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-query/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restxml/runtimeConfig.ts	100.00% <0.00%> (ø)
packages/config-resolver/src/RegionConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restjson/runtimeConfig.ts	100.00% <0.00%> (ø)
packages/region-provider/src/fromEnv.ts
packages/region-provider/src/defaultProvider.ts
...kages/region-provider/src/fromSharedConfigFiles.ts

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[AllanZhengYP]

Hi @jblz, Thank you for the PR. 🎉

[github-actions]

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