wave libraries and it's documentation are not matching, Please update them

[panchalhitesh]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Where did you put the widget on,
2. Run flutter doctor and paste the information here.

Expected behavior
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Screenshots
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Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Version [e.g. 0.0.6]

Additional context
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