* Update faq.md

* Update faq.md

handle channel gap and transfer data owner

fix typo

5 points landmark face alignment example

对其中一个问题，补充up写过的知乎实例。

* update faq.md about ncnn-produce-wrong-result

* update faq.md  about print Mat content and visualize Mat content

* update faq.md about efficient roi resize rotate

* update faq.md about convert to fp16

* update faq.md about use ncnn with pytorch or onnx

* update faq.md about add the url of netron

* update faq.md about add the url of convertmodel

* update faq.md about the url of darknet2ncnn

* update faq.md about tensorflow 2.x-mlir

* update faq.md about keras2ncnn

* update faq.md about Post Traning Quantization tools

* update faq.md about caffe2ncnn

* update faq.md about mxnet2ncnn

* update faq.md about bf16

Co-authored-by: runrunrun1994 <runrunrun1994@163.com>

* update faq.md about ncnn-produce-wrong-result

* update faq.md  about print Mat content and visualize Mat content

* update faq.md about efficient roi resize rotate

* update faq.md about convert to fp16

* update faq.md about use ncnn with pytorch or onnx

* update faq.md about add the url of netron

* update faq.md about add the url of convertmodel

Co-authored-by: runrunrun1994 <runrunrun1994@163.com>

* doc: add build-mlir2ncnn with commit sha and steps

* add mlir git log detail

* fix typos in docs

* still fix some typos in docs

Co-authored-by: wq.chu <wq.chu@tianrang-inc.com>

* Add [ MacOS ->  apple-cpu/apple-gpu] into supported platform matrix
 * Add [ mac ->  apple] into 'device support vulkan' list

Co-authored-by: meow <826150766@qq.com>

* add convolutiondepthwise/crop/sigmoid/tanh in operators.md

* sort by alphabet

* delete impl_type

* cannot delete impl_type

* cannot delete impl_type

Co-authored-by: yaobin.li <yaobin.li@rokid.com>

* update operators.md, add binaryop/Operation type

* fix with_scalar

* Update operators.md

* Update operators.md