docs: update sdk-middleware-http - default for maxRetries=10

[bianucci]

Summary

Update docs for sdk-middleware-http. Default for maxRetries is 10.

Description

Update documentation of sdk-middleware-http to reflect implementation.

The default number of maxRetries is 10.

See:
https://github.com/commercetools/nodejs/blob/master/packages/sdk-middleware-http/src/http.js#L64

[changeset-bot]

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Latest commit: 53ee948

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