Change max-body-size to use unit in documentation

[jancespivo]

According to the code change and particularly test here https://github.com/dapr/dapr/blob/c71b329a2249e70cc0f38ae88af7d50abcd28a4f/pkg/injector/patcher/sidecar_container_test.go#L1331 The flag gets string not int as the original http-max-request-size and requires unit specification, otherwise bytes unit is used as a default.

[marcduiker]

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