fix a bug of comments which may misguide users

[Feng1909]

PR types(PR类型)

Doc

Description

VisDetectionhas been changed from fastdeploy::vision::Visualize::VisDetection to fastdeploy::vision::VisDetection, but when using

fastdeploy::vision::Visualize::VisDetection(Img, result_left, 0.5);

The terminal will show:

[WARNING] fastdeploy/vision/visualize/detection.cc(294)::VisDetection	DEPRECATED: fastdeploy::vision::Visualize::VisDetection is deprecated, please use fastdeploy::vision:VisDetection function instead.

Which fastdeploy::vision:VisDetection should be fastdeploy::vision::VisDetection.
There is a ':' mark missing.

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